We usually roll into WDW around 3pm. We drive in from Houston, leaving home at 8am the day before, and stopping for the evening in Pensacola. The next day, we start out early am once again... and make a quick stop at Publix before we arrive.
I know a lot of folks want to get there early to try for a good room... Honestly, we've never been dissapointed with our room, when we get there in early afternoon... This summer, our standard view BWV room was terrific. I was so impressed with the view I actually called down to the front desk to double check they hadn't upgraded us.