Not to veer too far from the thread topic, but what came to mind when I read this is that 4E combat was really fun at first, both in terms of when the edition came out and the first third of a given combat. But then it grew tiresome - again, both in terms of a long-term campaign and after the first third of a specific encounter when it became an attritional slog.
I just remember the same basic formula playing out, again and again:
1. Start with encounter powers, soften the foe, then either:
2a. If foe proves to be tenacious, use daily powers, then finish off with at-will powers; or
2b. If foe is on the road to clear defeat, use at-will powers until dead.
Rinse and repeat, again and again. There might be slight variation, but the formula was the same. It was fun at first, but eventually became tedious - and especially when combat devolved to at-will powers slowing wearing down large hit point totals in combats that's outcome was a foregone conclusion. As a DM, I often ended up prematurely calling killshots "behind the screen" when the outcome became certain.
On the other hand, 5E was less tactical but moved away somewhat from grid-focused combat, so the theater of mind was re-sparked. But I know some of my players missed the more overt tactics of 4E, while others preferred the greater simplicity.