You maybe will get a free dessert after your meal... and CM's will congratulate you when they notice your Just Married button .... but room upgrades arent given out freely because of being on a honeymoon. LOTS of couples honeymoon at Disney, so they cant upgrade everyone. Most upgrades are given out when theres a problem with a reservation and Disney is fixing and acknowledging they messed something up. We got an upgrade once when they gave away our reserved w/c accessible, roll in shower room to someone else and had no other to give us.
Thats not saying it wont happen... sometimes you will get a CM that wants to plus your trip, but dont count on it. If it happens, it happens.
As far as advice... Since you havent been to Disney for so long and your spouse has never been, get a good guide book and see all the changes that have been made since 2002. Get a sense of how to get around the parks and property. Get savvy on how your MDE works, mobile ordering, magic bands and memory maker photos. Lots of success in your trip will be on relying on your device use. Plan out your day on doing the most desired attractions early. Make sure you have an idea of what your spouse wants to do and see most so his/ her trip will be one that hooks him/her on Disney so return trips will be in your future as a couple. Not all couples get that Disney bug and have a desire to return. So make it special and dont wear yourselves out trying to do everything on this trip. Do the things that matter the most and will make it memorable. GF is a luxurious resort with great service. You can walk through other resorts as well to get an idea of other places you may want to stay another time. The monorail gives you a good opportunity to see the Poly and Contemp.
Congratulations and best wishes on your marriage and future life together.