I like getting up from my desk and going to the lab to tinker, test, troubleshoot, and blow off steam.
I like playing legos on my computer (solid modeling).
I like doing calculations/making predictions and then going to test those predictions on products so I see the differences between theory and experiment.
I like that I am presented with new/unique problems continuously. It makes the day go by fast. I do not do well with repetitive tasks.
I like cultivating ideas from other STEM majors, browsing technical forums, and continuously taking graduate coursework in engineering/math/physics.
I like that my experience/knowledge/expertise is transferable. I am not learning a unique business process that is only applicable at said business.
I don't like filing a 20 page report to process a change order that requires 20 signatures from people that do not have technical expertise to justify why the length of my 10-32 bolt increases from 1/2" to 5/8".