Didn't get to read all the replies.... but last trip we arrived at the resort around 11am and hung out at the resort until our room was ready at about 2. I really wanted to change and get our suitcases unpacked before we headed out for the night. I knew we'd be back late and would be tired, and there were several items I needed to hang up. So, we chose to wait.
Our next trip, we are arriving around 7pm so we plan to get situated in our room and then head to DTD for an hour or two, and then call it a night so we can be at the parks first thing in the morning.
As for departure day, last trip we left around 2pm on ME. We went to Ohana for breakfast and MK after that, but found ourselves constantly clock watching. We ended up getting back to our resort earlier than we needed to because we didn't want to kill too much time at MK. I hated the feeling of needing to kill time, so I might see if we can get a flight out around noon or so next time. Or else, a really late flight like 8pm.