Am I a heavy drinker? No. But I do drink - a lot less now... but on average, I'll probably have some beers once a week. I could put down 8-10 and you wouldn't even know (I hold my alcohol really well.)
I had a very strong batch of Grand Marnier slushes from France. Even my sister and I, who are drinkers, found them a little strong.
The Tipsy Duck in love has given me a slight buzz. I got it for "brunch" one morning and it woke me up, but gave me a slight buzz.
The strongest drink that's really affected me was the Grain Train at Splitsville. I didn't realize what it was until I ordered and asked the bartender - it's made with grain alcohol. I went back to the room and took a nap. It really put me on my rear end!
Anyway - I usually stick with beers as I'm able to control what and how much I drink. When it comes to mixed drinks, you really don't know. You can go from feeling fine to bad very fast - especially if the bartender has a strong hand. With beer, I know that at 3 or 4, I'm gonna slow down. It's vacation, but it's also Disney.