I think that depends on if you are using Disney transportation. Most all of the off-site resorts that we have stayed at in Orlando, we are hitting Disney property in 10 to 15 minutes. There is one we like to stay at called Silver Lake that you drive out of the back of the property and in less that 2 minutes we come out at the red light that goes into the Animal Kingdom resort area.
There have been others we can see and/or hear the fireworks from different parks. We have used Disney buses to hop when we wanted to keep our close parking place and have waited for buses longer than it takes to get to most of the places we have stayed. If you drive your car to the park or are in the park close to the resort you are staying at, then I agree that you can get to your resort pretty easily.
I understand that popping in for a few hours works great for many guest. It just doesn't for our family. We love being in the park! We don't understand the idea of sleeping in and coming to the park later. I am very much not a morning person but when I am at Disney is the only time I am eager to get up and moving. I've been known to even wake up before the alarm and have to get myself to go back to sleep. We can't wait to get to the park and don't want to leave once we get there.
The day we visited MK in 2012, the park stayed open until 1:00 a.m. We spent 16 hours in the park that day counting our pre-opening breakfast and I was skipping on the way out (yes, I act like a kid when I'm at Disney

). We got in the park at 8:00 a.m. and left at midnight. But then we took the next day off. We would much rather do it this way because we truly love to be in the park. If it is open and we are going that day, we want to be there! That is how this family rolls. I know this isn't how everyone tours but it is how our family likes to.