You mention lots of summer patterns. Have you experienced this evening dropoff during times of the year with shorter hours?
Yes.
Admittedly, I since this is June, I was thinking more about summer touring when I posted. I've been that exact week a number of times. Low crowds that week, so it's easy to do lots! Winter temps in the AM and PM can be cold = walk-on rides. The danger of Feb is variable temps, limited swimming. Plus is (near) walk-on rides. We add layers in am and PM = trip to room. In winter= dark early, so there are always evening hours, especially if you use PM emh.
Most recent trip that week was 2012. Our hours and touring was like this (PM emh has since lost one hour):
Arrival day -
MK open 24hours! (Leap day!! We sadly stayed only just past 12am; we'd been awake all the previous night.)
Mar1: MK open to
8pm, (I think we did 11am - 7pm, w/7:30pm dinner w/ MK fireworks view)
Mar 2: Epcot 9 am to
midnight with emh (near RD to near midnight)
Mar 3: AK 8am
to 7pm with AM emh (emh too cold, but covered the park about 11am to 4:30pm, Chilly zebra viewing after Boma dinner!)
Mar 4: MK 9am to
midnight (10:30am to 5pm, then 8 to midnight)
Mar 5: HS to 10PM with emh (I think we arrived about 9:20am-4pm, had dinner, returned until 10pm)
Mar 6:?? not sure, prob MK to 9pm.
Mar 7 - Epcot 9am to
9pm. First day of FLOWERFEST. I distinctly recall it was SO cold the butterflies in the butterfly house were not moving! It was mostly cloudy. When the sun hit the butterflies, they moved for about 30seconds. then they froze in place. We came back hours later, and they were still sitting on the mesh box from which they had been released. We all wore hats, gloves, jackets.
Mar 8: We had so thoroughly seen all of WDW, that we went to IoA instead. Easily covered everything we wished to ride at IoA before 5pm. We rode the JP dino-flume, but skipped the rest of the drencher rides. we were so wet and cold after JP, that we happily paid the $5 for the people dryer!
So using emh, we had plenty of PM hours. Feb dark starts early= temps drop = walk-on. The only very busy day was leap day. Our last ride that night was IaSW, which had a wait at midnight. We almost fell asleep! The first day of the Flowerfest was moderately busy, but we were mostly there to see flowers.