It all boils down to what kind of camping works for you... If you need all the comforts of home and need to burn thru 60 gallons of water every other day, have at it!
When I'm at a FHU site, I use the water as I feel I need to. When I don't have a sewer hookup, I adjust the water usage so I don't have to dump until I leave.. I'm only a long weekend camper (Fri-Mon), so it's pretty easy to do..
But, I remember back in my teens and we didn't have FHU sites most of time and the rule was, you could use as much water as you wanted... YOU just have to haul it in and haul it out.. In other words, if you used 5 gallons of water to bathe, you hauled that 5 gallons in and hauled that 5 gallons out.. Then, it didn't really matter that you just took a shower when you sweated to haul it back out! :)
Mitch