I had my first ever solo trip earlier this month. First time staying at a Disney resort also; stayed 3 days at All Stars Sports.
Weeks leading up to my trip, I ordered a Fantasmic! MagicBand+. It was my first ever MB. In the past, we would just use those ticket cards for everything (scanning at the entrances, fastpasses, etc).
Once I got it in the mail, I charged and linked it in MDE with my account and it was pretty seamless. At WDW, the MB+ worked automatically at the turnstiles to tap into the parks, unlocking my door at the resort, scanning any lightning lanes I had, paying for stuff, etc. Didn't need to get it fixed with Guest Services or anything. Never had technical issues either.
I thought it was a pretty cool experience. Gone are the days I had to pull my wallet out and take out that RFID card. Honestly now to think about it, I rarely ever pulled my wallet out of my bag since everything was on my wrist now. I now completely understand the first-hand experiences I read about why having a MB may be super helpful on a trip.
Besides that, I loved interacting with the nighttime spectaculars, especially Fantasmic! (my favorite) and HEA. The band would light up and vibrate throughout the duration of the show. It was also do its thing on some attractions like GOTG, ToT, Tron, HM, etc. At the end of the day it would still have some battery left (never ran out), but I would recharge it overnight regardless.
So all in all, I would say it's definitely worth it. I don't have an Apple Watch, which I often saw some guests use instead to scan into the parks, so can't speak about that.