I've been dealing with the exact same problem. I've been working with Drupal for about 4 years now. I've coded some contrib modules, submitted patches to core,

I've been dealing with the exact same problem. I've been working with Drupal for about 4 years now. I've coded some contrib modules, submitted patches to core, attended Drupalcons, etc and am just not that excited by it anymore. Recently I felt as though I was spending most of my time configuring Drupal and not actually developing anything. I was bored out of my mind at work. On the side I've been working on a few Rails and Node.js projects. I found them to be enjoyable to code and intellectually stimulating. An opportunity came along a few weeks ago to join a Rails based consulting firm. I start in a few weeks and can't remember the last time I was this excited about work. As some of the other commenters mentioned, I'm hoping the lower level stuff is the breath of fresh air needed. Everyone is different but maybe you should consider switching things up a little and jumping into a new technology stack. Good luck with whatever you decide to do!