I would say too much beer is when you have too big of a stockpile that you need to up your consumption rate to get through it so you can brew again. I typically have one or 2 batches fermenting at one time and 2 on tap. So that when a beer on tap runs out there's another one ready to be kegged. I wish I had more fridge space so I could be carbonating one beer while the other two are on tap so that when one runs out all I have to do is hook it up and drink. But waiting 5-7 days isn't a big deal either.
I've only brewed 6 times this year, which isn't much for me. But I moved this past weekend so I didn't want to have beer to move, which means I haven't brewed in a couple months because of that. I'm aching to brew pretty bad.