I've tried code school, codecademy, and treehouse, myself (never really got into Lynda.com, seemed like the quality was too varied).

I like the treehosue approach - videos plus quizzes plus exercises plus projects - but I do think it's aimed mainly at beginners (which is probably why it felt goofy to you, because they're trying to make it approachable for people who aren't yet comfortable with technology).

I do wish there was a resource out there like Treehouse for learning more advanced topics.