Its about the same from all the hotels to the front of the parks as it is from the parking lot to the front of the gates. Depends on how fast you walk. I had to get back to PB from USF during Mardi Gras, and I made it in 4 minutes...briskly walking.....and breathing heavy.
The boats drop you off in the middle of City Walk in that big lake thing in the middle.....on the east side, and the parks on the west side. All in all it will take you the same amount of time to get to the boats, wait in line, get on a boat and ride, as it will take you to just walk to your room from the park. But it all depends on how tired you are. Now, with that said....its still a helluva lot shorter than the Death Marches at disney. But at the end of the day at either, your feet dont care...an inch feels like a million miles.