For razors, I use a Venus-style. I keep the disposable blade refill (I only need 1 for a week) in its factory packaging, and pack both it and the razor handle in my toiletry case in my carryon bag. DH brings a small electric razor. We've never had an issue at security with either of them.
I don't know if you're looking for any other "packing light" tips, but if you are, and with apologies for anything I might be repeating from previous posters:
My family has never checked a bag, nor have we needed to ship items to a resort ahead of time. Here's what we do to fit everything we need for a week's vacation in our carryons. If you can avoid the desire to pack things "just in case" (and if your kids are potty-trained and able to handle a single piece of luggage) it's easy!
1 - We use a packing list and stick to it. If it's not on the much-vetted list, it doesn't go.
2 - We try to pack light and smart. Each person's 21" piece of wheeled carryon luggage holds (rolled up and placed in color-coordinated packing cubes): (1) one shorts/tee outfit per day with socks and underwear for each, or less if we plan to do laundry; (2) one pair of waterproof hiking sandals; (3) one swimsuit; (4) one pair PJs. (We can also squeeze in a princess dress for my daughter, when the occasion demands.)
To my carryon, I add a toiletry case with all of our non-liquid toiletry items and prescription meds. Because the kids' clothing takes up only half of the space inside each of their bags, I add to their bags a small packing cube of "miscellaneous" items such as a nightlight, cell phone and camera chargers, clothespins, wet wipes and rain ponchos, and a second packing cube with a cache of breakfast items, typically Pop Tarts, oatmeal mix, Fiber one bars and/or coffee filter packs, with disposable bowls and spoons. (The space occupied by food on the way down is then used for souvenirs on the way home.) Our 3-1-1 liquid/gel bags go in outside pockets of our luggage, for easy removal during security screening. Mine holds my liquid makeup items, toothpaste, and moisturizer. DH's holds a sample-sized shave gel, laundry detergent pods, and sample-sized hairstyling products. Both of the kids' 3-1-1 bags are filled with sample-sized sunscreen spray.
3 - We don't bring anything the resort is going to provide (soap, shampoo, towels, hairdryer, etc.).
4 - We wear all of our bulkiest clothing items (jacket, pants, sneakers) on the plane.
5 - DH and I make the most of our "personal items" for the plane. Mine is a tote bag -- a Baggallinni Kindred Tote if anyone wonders, the most awesome tote bag for air travel I've ever owned -- holding my purse (a small cross-body one I use for park touring -- inside the purse is my camera, a mini first-aid kit, phone, keys, sunglasses, travel documents, cash/Mousekeeping envelopes, touring itinerary 3x5 cards, ID and credit cards), reading materials and headphones for the plane, snacks for the trip, and Magic Bands. DH's backpack holds "care packages" for the kids with headphones, activity books and snacks, his own wallet and phone, sunglasses, his own reading materials for the plane, and the kids' autograph books. (We could pack even more things if we gave the kids "personal items" such as one small backpack each, but we haven't needed to, yet.) We used to pack little neck pillows for the plane in DH's backpack as well, but they never got used (and you can make one by rolling up a hoodie, in a pinch), so now we leave them behind.
6 - Tip: If you're having trouble fitting everything in your carryon, don't be hesitant about packing half of the clothes you need, and planning to do laundry. If you're staying on-site, you should know that the laundry facilities at the resorts tend to be located close to the pool! That means you can throw the laundry in the the machine, go for a swim, meander over and toss your clothes in the dryer, go read a book on a lounge chair, and then collect your laundry after you're satisfied with your tan. Doing laundry will never be more effortless and pleasant than at WDW, and if you tend to favor a relaxing afternoon by the pool in the middle of your stay anyway (most of us do!), it won't disrupt your vacation in the least.
You asked about "carryon issues." The only packing tip I can think of (besides remembering the 3-1-1 rules for liquids and gels), is to pack nail clippers and an emery board as your entire "nail care" mini-kit, and don't bring a long metal nail file or any other sharp metal implements. I think technically they're allowed, but metal nail files are the only things that have caused me problems and required me to go through additional screening at security.
Also, be sure to weigh and measure your bags at home after they're packed, to make sure you haven't exceeded your airline's limits for carryons. (You don't need specialty luggage scales, although bathroom scales tend to be inaccurate with small weights -- to get around that, just weigh yourself on your bathroom scale holding the bag, weigh yourself without it, and then subtract. We find that our bags tend to weigh no more than 25 pounds when packed as I described above, nowhere close to the typical 50-lb. limit.)
