Read Proverbs for a description of Drunkeness. It includes falling, stagering while walking, vomiting, "mysterious" injuries the next day, redness of the eyes, headaches, lewd behavior,etc.
It most certainly does not includes feelings of happiness, joy, laughter, sillyness, forgetting the troubles of your everyday life, etc. Those are the result of a "merry heart".
One problem I have noticed over the years among (otherwise biblical) christians is that when it comes to "how much" one should drink, they do not turn to the scripture for the standard.
The bible describes the standard of holy use as "lawfully tipsy" (love that one Andrew

). As well as clearly describing unholy (i.e. sinfull) use.
Many time I hear people who believe that "it is OK for a christian to drink" describe their position as one or (possibly in rare cases) two drinks. Now unless they are VERY big drinks that is not going to make anyone "merry".