I generally don’t play alts or even multiple specs often because it takes forever to develop the digital dexterity and muscle memory to play one well (especially a healer). It truly feels like playing a completely different character when solo versus grouping.
It’s not really an overreaction to me, though. Perhaps I could get used to them, but it seems ridiculous that I should have to force myself to use an addon to change UI elements to something I dislike because Blizzard won’t let me see the existing ones when I need them. I greatly dislike all of the addon replacement frames.
That’s an option, too, but I have a very, very strong preference for the stock Blizzard raid frames. Perhaps you’d be better off with a UI which can handle more customization?