Very true. If I see mine drooping at all in the morning, I will water just until it starts leaking out the holes near the bottom. In a few hours, it's back to looking perky. Also, I try to avoid wetting the leaves when I water (put the hose at the base). I used to have a kind of rotting/holes in leaves, but that stopped when I stopped wetting the leaves. Maybe just coincidence, I don't know.
From the Frozen Tundra