I spend 95% of my time playing D&D as the DM. I spend hours alone setting up adventures, drawing maps, and rolling random numbers. I find it to be at least as much fun as playing.
My percentage dice never went anywhere.
A good way to bring them back to the table is to return to the use of percentile spreads in some classes. I remember thieves and assassins needing to keep a pair of ten siders ready at all times. Wizards and clerics needed them too just not as often.
D20's are okay but designing everything around them makes for some lonely dice in your bag.