That's an odd complaint. The time to solve a proof for the first time is when you're doing your homework. The course work is supposed to make you practice until your brain can easily pick up the recurring patterns.

Sure, if the course is very poorly designed or the student is very unmotivated, they may end up just memorizing everything while somehow avoiding understanding anything. But in real life, when someone says "Oh I understand it, just give me thirty minutes to solve it" and others "shit them out" in 5 minutes, it's usually the shitters who are ready to advance to the next level.