You do need to wipe it down after each shower, otherwise it does look pretty bad as the spots will dry all over it.
We use a squeegee on ours ... but at least it's a reason to do a few morning deep-knee bends for exercise.
In our new Juneberry we won't get the glass shower. Partly because I'm kind of tired of the maintenance, but also because of the Juneberry's layout. If the ensuite was such that the shower was an integral focal point then it would be worth it. But in the Juneberry the shower is in a separate area with just a toilet butting up against it. Not much point of opening that up, so IMO it's not worth the upgrade cost nor the extra cleaning work. So we'll spend our upgrade money on something else.