I think you might be doing something wrong.
I agree, I got most of my spells on keybinds too unless I use them very rare. Most spells are pretty usefull in PvP, even though it might not be a moonkin spell itself and even in PvE many come in handy at given times.
While I'm sure that I will find room to get 3-4 more keybinds in, I think it will be somewhat difficult to place them where I'm realy comfortable with them.
But anyway: Up to 5 mushrooms? Together with the other new talents that realy does sound to good to be true. Wish I could test it out
(even though 90% is NYI :/ )