First, I apologize for all of these NON adult posts lately, but sometimes I just feel excited about something, and that's what I decide to share.
In this case, I just found Painter's perspective grids. They came out with Painter X3, but nonetheless, they're awesome! I don't know how Photoshop does them, but since I prefer not to use Photoshop for the drawing portion of my process, it doesn't matter. Ha!
Anyway, there are presets for 1, 2, and 3-point perspective. I haven't found (m)any tutorials on them, so I'll figure them out myself, but in the first image, you can see the red line, which you can drag up and down, and the green circles (2-point perspective, in this case), which you can drag up, down, left and right. Individually.
You can change the intensity/opacity of the lines too, and you can lock your lines to the grid. Apparently. I haven't messed with that. But this will surely make drawing a lot easier, because perspective is my enemy.
I'll try to upload something juicier next time. Until then!