My king sized bed uses a quilt as a bedspread, and I have a cat that sheds a lot. I wash my quilt every other week in a front loader. I did use a color catcher the first time I washed it, but it was stable so I haven't used one since. I do use color catchers when I wash my red blouses, and have had no problems with them in my front loader. The only problem I have with home laundry of a king sized quilt is drying it! Imdry it for 20 minutes on medium, pull it out and rearrange, then repeat the procedure 2 more times.
However there are lots of variations in front loaders, so YMMV. Mine is a Samsung, and is hands down the best washer I have ever had. Clothes get very clean with not much water or detergent!
Pam