Bingo. Implementing features doesn't usually require it, but keeping an entire system in your head with all its complexity and chain reactions from making something work another way keeps me from moving ahead sometimes -- especially when it isn't clear what the best option is. A beer or two helps me pick one and keep moving, to discover the answer as I go.
That said, for personal projects in the evenings, I find having 1-2 drinks helpful for removing barriers to perfectionism when you have simple coding tasks to solve.