I'm a fan of Katie's. I haven't used many laundromats in my life so I can't compare Katie's to much in that regard but I've found the facility to be clean and the employees to be helpful. Katie's has a range of sizes for their washers/dryers that are priced accordingly so you can easily clean bedding for a king size bed or your everyday clothes and delicates.
I've visited early on a Sunday morning as well as in the evening after work. Both times there was a crowd but ample machines were still available.
There are also plenty of carts to help you transfer your clothes to/from the washer and dryer or from your car.
Parking can get a bit tight but there are spots on the street when the lot fills.
All in all, being able to swipe your debit or credit card to get your laundry done and fold on tables with ample spacd makes for a very efficient laundry experience.