For myself I'd say that the primary reason I drank was always for the buzz. It usually felt that it was something else though, usually that drinking would enhance the enjoyment of being with friends, of watching a film or that it would help relieve stress and aid relaxation.
These are all different forms of pleasure so I'd say that my conscious reason to drink was pleasure. But, as we know, drink doesn't really give pleasure - if it did then the more you drink the more pleasure you would get ad infinitum. So I really drank for a different reason, and this was for the buzz or the 'deep pleasure' as it's sometimes called in AVRT.