So I have been testing with or without park hopper with my visitors all summer. I actually prefer, when we have more than one day, to NOT do park hopper. The parks are easy to switch from one to another, but walking from the end of one park to the end of the other park is still pretty long.
I think going to DL on the day it closes early it not actually a bad plan. ON those days, the crowds tend to be okay but DCA becomes ABSOLUTELY crazy when the Halloween party starts. Also, I feel that when we did not have park hopper, it really helped to appreciate the park and be less tired. DLR is smaller than DW, but in my experience, four days in a row from RD to closure is still too much.
DCA has a lot of activities and shows that we tend to not do when we have hopper. The Frozen musical is FANTASTIC and Animation Academy (where we learn to draw a character) is one of my favorite thing to do, so on days where we do not hop we have more time to do that. Also, Guardian of the Galaxy has a new video for Halloween that only runs at night, so the wait is ridiculous right now.
Hope this helps!