I like wider screens 'cause I can have multiple editor/terminal/etc windows wide-by-side... I find things usually just fit together "better" on wide-format screens than on 4:3 screens.

So yes, I believe wider screens are better. :]

[Needless to say, I also find the constant bloviating on places like HN from people that think 4:3 screens are better for dev work pretty silly...]