I am convinced that it should be possible for "too much garlic" to be a phrase with utility; however, I have yet to encounter a situation wherein it might be used.

(I have been to a garlic party, which featured pickled garlic, garlic chocolate cake (INSUFFICIENTLY GARLICY), garlic ice-cream, but sadly no garlic vodka, because the person in charge of making the garlic vodka drank all the vodka.)