Would a buddhist really enjoy life, after achieving enlightenment or nirvana afterlife?

They seek in vain, for there is no afterlife, and no Nirvana. Enlightenment is simply an induced and artificial state of mind, which can be experienced in many ways including deprivation, drugs, and meditation. The Buddha tried all three (not sure he did drugs though I wouldn't be surprised) and he goes down in history as the worlds biggest drop-out. If you discount his founding a new religion, which I do, then his was the ultimate in wasted lives.