My Priest just hit 108 and leveling is so much worse with mind sear gone.
Having to spend 2 GCDs to start AOEing every time your target dies is so unfun. And since your main target gets more damage than all the others from mindflay AOE (since it has shadowword pain), it's of course always the first to die and you have to reapply swd to aoe the rest down, but your new target will likely die in 1-2 GCDs you then after 1 tick of mindflay aoe you, again, have to swp a new target.
This actually has taken a lot of the fun out of my shadowpriest leveling, whoever thought this was a good decision and how did it get through the PTR? It's not like shadowpriest has 40 buttons to press... with only 1 heal it's actually the opposite really.
I was actually looking forward to those out-of-S2M buffs for this guy, but even the removal of the haste buff after voidform stuns me... that was really fun since the out of voidform rotation isn't really fun otherwise IMHO :/
It felt good when questing to hit a 30+ haste buff after voidform ended because you pulled a lot or a big boss, but now after voidform ends I just feel so... static I guess.