Eh, problem with EM at the moment is that she has no real late-game pay-off but is an increasing pain to use in the late-game. It's almost always easier to get down to 50 piety, drop an entanglement and drop out to someone who has decent late-game boons than have to deal with plants sprouting everywhere around the boss, the risk of getting locked out of more piety game and increasing clearance costs. She's currently not usable on plant-heavy levels (especially that one with the druid boss), even for Paladins, really, and a huge pain on maze levels or blinking-boss/lifesteal levels.
As long as she becomes less useful and more awkward as the game goes on I'll keep converting out. I think mana on clearance would fix that for a few characters (sorcerors in particular) but not really solve the general problem. You really need either some sort of late-game pay-off that uses her disadvantages (possibly based on number of visible plants) or to make clearing out the plants a lot easier.
---
Incidentally, new Taurog % damage increases are a nice incentive for non-Berserker non-casters to use him. Slayer wand is much better than the monster whistle. Think it wouldn't be bad making it small. New TT prep cost is a fantastic deal (as in, irrelevant to) for assassins but a big problem for everyone else - it completely screws up wonafyt if you get it, makes popcorn collecting, hence leveraging TT's XP gain bonus, very rough and hits your piety. It could maybe be used by vamps to double-up their bloodbanks... would be a hilarious synergy. Anyway, I think something that lowers XP gain or increases the XP gain you need for a level-up might be a better drawback for the TT altar. That way it affects assassins too but doesn't completely stop other classes using it, and it also encourages you to actually get using the altar early to make up for your XP loss rather than what I'd currently do, which is find a quicker piety-gainer to convert in from, knock out the protections then swap in.
(I think keeping the GG magic res % is fine - don't think it would figure too heavily in a decision to swap out at the end but it would really make me very chary about going in for a bit... which isn't really the problem with GG, I think)