[pkorzeniewski]

Laziness is one thing, but jQuery covers so many browser-specific issues and differences that it would be insane to cover it all by yourself. Sure, if you have a simple script with several lines of code than you can go without jQuery, but anything more complex - no way, you will produce 10x more code with 10x more bugs. The only argument against using jQuery could be its size, but let's be honest - nowadays, unless you do something targeted at users with very low connections, it doesn't matter, even on the mobile.