I'm taking my kids to the Bronx Zoo alone Thursday, so I'll let you know how I manage!
Nothing keeps me from getting out of the house and doing things with my boys, I would do WDW alone too if I had to. I think you'll do fine.
I'm actually sending DH on a Segway tour one morning this trip and going to MK with the boys alone. It will be an EMH so I'm hoping for manageable crowds. The only thing that I'm concerned about is getting on and off the attractions with the moving floor. I'm hoping a CM will assist my older son while I hold the younger one.
My kids are the same age as your. I highly recommend the Joovy Ultralight Caboose stroller, I bought it specifically for WDW and malls,themeparks, etc... it stays in my car. I'm in the city, so my everyday stroller is a Bugaboo Cameleon w/kiddy board for my oldest.
Last Nov, I went to WDW with a side by side double and HATED it! It was a nightmare, everywhere I looked I saw people with the Joovy Caboose! My DH had to say, how come we don't have that one!
It's such a dream to push. My DS4 still naps, but we plan on taking daily park breaks for naps for all of us. If you plan to get out EARLY and be at the park when they open, the lines will be managable, leave when the crowds come around lunch then head back in the evenings, you'll be fine.
You're staying at a great resort. I stayed at the Poly when DS4 was 1 and with my mom. She couldn't lift the stroller or the baby to climb on the bus. We went to AK very early and had an empty bus, which worked for us since we took a long time getting on the bus (the driver DID NOT HELP ME!). After that, we avoided the bus the rest of the 10 days. We went to MK and Epcot mostly a few times we went from Epcot to DHS by boat. I recommend this if you don't want to fold the stroller, it's longer but for one person less drama.
Don't feel like you have to see and do everything. Do what's comfortable for you. Most importantly, don't feel like you have to rush. If it takes you an extra minute to pack up the kids, so be it. People can wait.
Just a suggestion, but if you should ever feel that you need an extra set of hands, Kid's Nite Out is a babysitting service (which I'm using this trip for the first time) that offers Mother's Helpers. They could assist you at the theme parks during the day. I thought that was a great idea, something I never would have thought of! Their website is
www.kidsniteout.com