I assume this varies by crib... I just lowered DD's mattress and thought that I should lower it to the lowest one so I wouldn't have to worry about doing it again. I figured she's just about pulling up so i'd have to move it really soon anyway.
It's so damn low now I felt like I had to drop her the last 2" to get her onto the mattress! haha Ok, slight exaggeration. But it is really super low and I had to stand on my tippy toes and bend my body all the way over the rail to get her down there. (it's not drop side).
Re: Is your lowest crib mattress setting insanely low?
We haven't lowered ours yet but will soon. I actually bought a step stool for myself because I am short and knew i might have that problem.
I had to do the same thing. It doesn't seem that low now that I have gotten used to it. I also wish it was lower because DS can reach his wall art from the crib and wipes his wet snotty fingers all over the wall and I don't look forward to repainting that room.