I daily drove my 2001 GT. Then I got a 2nd car for a daily and it made driving the mustang a lot more enjoyable, especially not having to drive it in the winter.
We have a Suburban for hauling the kids and I have a company F150, so both the '16 and the '13 sit in the driveway until I get a wild hair to drive them.
My GT500 was my daily for about a year after I moved to Arizona. Weekend car after that, but when my daughter got here I just couldnt find the time to drive it. It did bring her and mama home from the Hospital though!
The biggest issue Ive found is tire flat spotting from sitting. Needed tires anyway so thats a plus haha.