Now you can make a hotkey to swap between sets. Never need to mess with menu at all. That's a big improvement, I'd say!
As far as I know, you could always make a hotkey to swap between sets. /memspellset Raid or something like that.
Just pointing this out, each hot bar has 10(?) rows that can be reached by using the up/down arrows on the bar. One might think one could have one bar for each set. One bar, multiple rows. As was pointed out you could have always done this.