With BG1 I found RTWP not as bad. Why? Less things to juggle. Less powerful enemies and not so complicated.
BG2 was considerably harder. Enemies were much harder and battles requiring more knowledge of what spells do what and what enemies are resistant to what.
SO many BG2 fights were save scummed in order to just get through the game. That is no fun to me.
But I think you hit the nail on the head. If you are really good at multitasking, RTWP is probably perfect for you. I am not. Let me focus on one at a time so I can see what I'm doing and plan accordingly.