There's (almost) nothing worse than stumbling across a project written by a bored developer and then having to support it. Instead of a perl script and some SQL, it will use some smattering of the techs that you mention above. Often not for any real reason, but just because their job isn't demanding enough so they make it as interesting as possible. But it's better for everyone if you do this on your side projects - when you leave your CRUD job someone else is going to have to maintain the wobbling stack of technologies that you used to pad out your resume.