Picked up some of that Not Your Father's Root Beer. It's not that bad. Not as great as I expected it to be, but it's not bad at all. I can't even taste any alcohol in it, but you you drink enough that 5.9 will sneak up on you. I'm not really sure what one I like better, Row Hard Root Beer or this. Row Hard has more of an alcohol taste that seems a bit much, but good. This like I said you can't even taste alcohol.
I'm not a huge fan of these styles of beer but after trying Not Your Fathers I had the Coney Island Root Beer and frankly I preferred it. The Not Your Fathers was more medicinal with sickly-sweet sugar flavor, but the Coney Island was like drinking spiked A&W root beer.
Like I said tho, I'm not a huge fan of that kind of beer.
But to answer your post I pace myself big time. It usually takes me 2-3 hours to get at a nice buzzed state and I haven't been shit faced drunk in years. And I don't get drunk off beer anymore. I usually drink beer during meals or just to relax. My drink of choice these days is either bourbon or whisky. I only get bourbon because it's cheap and after 1 glass all hard liquor tastes the same to me. Weather I'm drinking a nice Irish whiskey or a cheap $10 bottle of E&J.
The reason it all tastes the same is because no one actually savors the flavor of Irish whiskey. It's generally shooter fodder. You want to see a difference, buy Makers Mark then buy Johnny Walker Double Black. They're both whiskey at the core but quite different in finishing.
Or if you want to be cheap about it, look for Four Roses Bourbon then compare that to something like Cutty Sark. You will see not all whiskey is created equal.