I don't know about GP but I reboot into Windows to play games every other day, usually multiple times that day. Reducing boot time is always welcome.

Also I'm having GPU issues right now, I had to RMA the replacement GPU, and I'm using the buggy Chameleon bootloader to extend the lifespan of my Mac Pro 1,1 past the EFI32 cutoff. So I'm rebooting quite a bit nowadays.