$ !== 'Holy Grail';
jQuery is a tool, not the basis
So why is this important?
Keep thinking about the necessity of jQuery
In the end, it's all about the discipline of the developer. The only way to prevent the risk of writing too much jQuery is regularly evaluating your own scripts. Think hard about the code you write and keep asking yourself if you are writing the code you should be writing and if there isn't a better way. Easier said then done, especially while doing stressful projects with a deadline that keeps coming closer at an alarming rate, afterwards it always turns out to be worthwhile though.