I use mtgox because I don't trust any other entity with much of my funds. We've seen many exchanges come and go (bitcoin24,bitcoin7,tradehill,bitparking etc) but mtgox has been here all the time.

Mtgox also has the highest price (and much volume/depth) and I am able to withdraw euro (or simply wait for price to equal any other exchange which happens occasionally). If I'm going to sell, it makes sense to sell for the highest price I can get.

In conclusion I like gox, and I feel that my funds are safe with them.

Goxxing doesn't bother me so much, yes it can be annoying, but trust is more important for me (but i don't trade a lot anyways). I think btc-e is great, low fees, many trading opportunities, but I don't trust them as much (or more precise I'm fearing that they will eventually be targeted by law enforcement).