But how many of them do you really use?
On the Dell Streak and Samsung Captivate (and possibly other Galaxy S phones), you have the option of deleting blank screens. But on the EVO and most other Android handsets, what you don't use is still there. Home replacement apps let you select the number of screens you want to use, but if they only offer preset numbers, then you're left with blank screens again.
This isn't really a problem since you can choose which screens to leave empty and simply not go to them. HTC Sense and some third-party launchers offer Leap (shown) and Leap-like variations as well, so you can still access everything if you don't fill your home screens in sequential order.
Even so, it's always a little disconcerting to me when I see all those blank screens. Even though I really only need two home screens (there are other ways to get to my apps and I don't need a bunch of oversized widgets all over the place), it still seems like such a waste to leave so many empty.