The loss of "Energy Adventure" in EPCOT is not that big of a deal to me. It was ok, but was definitely skippable if you were on a tight schedule. I doubt many will lament its loss, especially when its replacement, featuring The Guardians Of The Galaxy, opens up in a couple years.
"Movie Ride" (at Disney's Hollywood Studios), though...
Yes, it's somewhat dated and even "quaint" compared to today's whizz bang attractions, but I'm taking this one personally. It was the very first attraction we saw on the very first day of the very first trip we ever made to WDW, in 1991. My son Mike was just 6 years old. The next 10 times we went there, it was the first thing we'd take in on our Hollywood Studios day. So even though my current status makes it unlikely I will ever get to WDW again and therefore the point is moot, I'm still feeling a little sad and sentimental about this.
Movie Ride will be replaced by a whizz bang Mickey and Minnie ride. Actually, it's about time, as it's the first full-fledged attraction centered on Mickey ever, but I could think of a few other things more worthy of getting the axe...
