I made the switch to Blogger.com! I've used WordPress forever, and I can't say I really ever had any large complaints either... other than the hassle of updating it (for fear of being hacked).
Moving 5 years of posts to a cloud-provided blog site (like Wordpress.com or Blogger.com; so I don't have to update any code) takes a lot of work though, so what I really needed was some motivation to do it.
Lucky (or unlucky) for me I finally got that opportunity when DreamHost screwed me over this week. The shared web server that hosts all of my sites (including sites for most of my friends, who share the costs with me) started performing like total shit (about 20 sites total). When I contacted DreamHost they told me that one of my sites was consuming too many resources (thus the insane slowness). Other than a somewhat outdated wiki page they didn't offer me an ounce of help with solving the problem either. Wellllll, long story short, I spent 3 hours completely tearing everything apart. I ultimately took every site down and killed every single process owned by my account. I ended up with a single static test page and it still took 30 seconds to load. In desperation I contacted DreamHost again and begged them to throw me a bone.
To my shock, I receive a quick reply stating that someone else was causing the slowness. They were "so sorry" they had wasted my time... I was so pissed! After spending another 2 hours putting everything back together I decided it was the perfect time to make the switch... afterall, I wasn't going to get any more familiar with the setup. I ended up choosing Blogger over Wordpress.com because I am a Google fanboy and I think their theme engine is far superior.