Totally fine with the use of js and jQuery in particular. I really like jQuery, it's just... Well, fun.
If a guest is blocking js in their browser there's soooo much on the internet that will be broken for them, I don't have a lot of sympathy. jQuery and CSS FTW, two great tools that work great together!
For some reason, many still have a mentality of JS as being a "meddling" language that adds nonsensical little trinkets to webpages (remember those silly scripts that made snowflake graphics descends from your browser?). But as VincentU said, it is part of the future of web development, and is a necessary component for rich interactive UIs.