Why does level grinding have to be so painful and dull?

It was a clear jump from level 20 to level 40, how did the designers expect me to get the levels that quick?

And on a less whiny note, how was the new Harry Potter movie? It's good to finally see them doing the movies in two-parts to avoid cutting huge details out(Albeit this would've been nice way back at #3), but was it any good?