I had lapband surgery back in August 2009 and apart from the first 2 months or so, I have had no real problem with foods. You just need to make the better choices. Softer, more chewable foods. 1/2 cup to 1 cup serves. I eat lots of fish and mince dishes, casseroles, stews, but occassionally I can eat some steak (medium rare as it is softer) and chicken (although if to dry forget it!).
So far (in 5 months) I have lost 60pounds. Have been exercising from 3 weeks post op and even jogging (never thought I would do that). Honestly, 3 months post op, making sure that you make the better food choices, you shouldn't have any problems with a trip to WDW. With some planning you would be fine....
I am heading to WDW in October for 2 weeks and cannot wait for my Disney dream to begin........
good luck with whatever surgery you decide.......I can honestly say for me, it has given me back my life!