Before renting, my wife and I lived in a house with a small, unfinished basement. I had to duck or dodge to avoid whacking my head on the solitary light hanging from the low ceiling. I hated going down there, but I had to do it all the time because our laundry stuff was down there.
In our new home, we have an enormous finished basement with an eight-foot ceiling, recessed lighting and a full bathroom. Part of it will be used for storage, another part for housing a treadmill and an exercise bike, and the rest will eventually feature a home cinema setup with a large screen, 7.1 surround system and a little fridge. In the mechanical area, I'll have our home networking equipment and a freezer. An unexpectedly large egress window provides plenty of natural light.
After pounding away on the treadmill for a few minutes, I'll be able to walk straight into the bathroom for a shower and then flop down in front of the TV with a cold drink from the fridge. Maybe it'll take a little while to buy some of this stuff and set it up, but in the old house it was never an option. With a couple of sofa beds, it'll make a great spillover bedroom for guests too.