Except that bliss was never depicted as being received with consent. Anyone taken within range of the spores was infected (except Kirk). Once infected, the victims are compelled to introduce and expose any new arrivals to the spores.
No one is depicted as voluntarily choosing to be infected by the spores after being informed of their affect. Everyone infected is ambushed by someone already infected.
Is it still a wonderful place if your consent is removed?
Exactly. It's not some harmless bliss, it's an imposed compulsion to infect others and enforce absolute conformity, like the Borg. The numbed contentment is just part of the trap.
As I mentioned earlier in the thread, there was a deleted passage (included in the Blish novelization) that would have explained the spores had a degree of sentience, so they weren't just a drug, but basically entities that enslaved others to serve and propagate them. Essentially it's Invasion of the Body Snatchers, except they just take you over instead of cloning you.