[__--__]

I used to feel this way too. My first job was writing a web app to replace a paper approval/overview process at an engineering firm. Aside from some email notifications, it was entirely CRUD and, to cap it off, I was forced to use classic ASP (in 2005 - asp .net 2.0 had come out by then, making classic ASP 3 generations old).

After 6 months of adding more and more approval flows, I had enough of the tedium, so I started writing libraries to make classic ASP easier to use, including a hash table library. Then I focused on how to write CRUD apps faster, with less code. Then I focused on making it more interactive and wrote an AJAX library. And if you want real difficulty, try making a classic ASP rest endpoint running on decade old hardware over a horribly designed MsSQL database performant.

I guess the point of that story is anything that bugs you on a daily basis can become an interesting and difficult problem to solve. Constraints make simple things more difficult, but you did say the harder the better. :)