I just did level 1-50 as WHM on a new char and.... i didn't had time to get bored (started the character on thursday and i just finished ARR tonight with only Bahamut missing).

In fact, the 1-60 (and even up to 70) is probably the most fun part as a WHM.... After that the Tank became too OP and you have too much healing tools to even break a sweat on normal content :/