I think you'll be fine.
Last year in October, on a 10 day trip, we decided to hit Tomorrowland, and that side of the Fantasyland on our first morning with the intent of leaving right before the parade.
We walked on Buzz, then did the Speedway with about a 5 minute wait, walked on the Teacups, used a FP for Space, did COP, PeopleMover, LaughFloor, Dumbo, Barnstormer, FP at Pooh, Lunch at the Plaza, and SDMT with FP. We did get caught up in the parade crowd as we were leaving, but were out the gate at 3:30 and on our way to Epcot.
All in all, everything went about as well as we had hoped. Longest wait for an attraction was the LaughFloor, just because we had to wait through the previous show. Plaza took a little longer than expected, which pushed us later into our FP window for SDMT, and caused us to not get out before the parade started.