I think the figure of 8 is cool. It's unusual, and I don't mind elements which supposedly "kill" pacing. I like Nemesis' stall turn and I like that Montu's first and second half are very different and separated by that MCBR.
I can see that figure of 8 being designed as a suspense builder. Whether or not the designers were being that avante-garde is beyond me, but my logic is that if that first half is supposed to be intense - even if it's visual intensity from ground hugging, fast-paced, dashing about, the such an element away from that, high up and slow is a chance to think OH GOD WHATS NEXT, open your eyes and catch your breath, before ****ting yourself again.
Of course, this won't exactly work with most of us, but I think it's possible to still appreciate a design like that.
Alternatively, is it a visual design aspect for onlookers? Busch are big on these, and they usually involve a part of the ride which is slow and gives onlookers the chance to look at riders and laugh at their faces.