It was one of the last vestiges of 1st-run syndicated animation, before Fox took over weekdays in the early 90's. Disney had already broken ground with DuckTales and Chip 'N' Dale's Rescue Rangers, and in 1990, the studio seized the opportunity to expand that block even further.
The Disney Afternoon, in all, lasted 7 seasons (1990-7), with a diverse lineup of programs, most of which have been reviewed here before. Adventures of the Gummi Bears was given new life, although no new episodes were ordered, after it ended its network run, and was one anchor of the block the first season. You know most of the shows by heart. TaleSpin. Bonkers. Darkwing Duck. Gargoyles. Goof Troop. Quack Pack. Aladdin. The funny thing about all this is, while Mickey Mouse appeared in the block open, he wasn't given his own show. That wouldn't happen until after the block ended, when Mickey landed at ABC (after Disney bought the network).
The following video collects the intros of all the shows that were in the block during those 7 years.
Everyone has their favorites, of course. Too bad Disney can't be bothered to have these classic shows air on Disney Channel or DisneyXD in a prime spot instead of flooding the schedules with lame live-action cookie cutter sitcoms.