There are courses I play where you'd be carrying it the entire 27 holes of up and down hill travel
I don't have a cart at the moment, I want one for longer (flatter) courses, but I think you're stuck having both if you every play anything that doesn't really resemble a ball golf course.
I play courses such as "Bicentennial", "Coyote", "Beaver", "Saddle Hills", "Zboaz", "Veterans" in the DFW area. Not going to say it's always no problem with a cart, but these courses are anything but ball golf courses and I've never wished I was carrying a bag instead. Granted...I doubt I would play cart or no cart on courses more rugged than those. lol..