Well I'm an ET so I'll try to answer your questions but I've never seen anything outside of prototype (I'm a SPU) so my knowledge is limited. There's not another rate I'd rather be.
Operating (standing watch) is what I enjoy the most. Reactor Operator, Reactor Technician and Throttleman.
Other than that you could be doing: Maintenance (Flipping switches and taking voltages for the most part), troubleshooting, random crap that needs to get done, and last but not least, Paperwork: making paperwork, reviewing paperwork, getting paperwork reviewed, filling out paperwork, looking for paperwork, shredding paperwork, making copies for paperwork, looking for paperwork binders, etc.
You wont work with circuit cards as much as you might think.
We're the smallest division besides RL Div (ELTs) and that does make a difference. ET manning is pretty bad right now, which is why our multiple is 10 and and the cap for STAR is $90k. It'll probably be higher by the time you get around to it.
Our work is the most political because it involves reactor safety so that gets in the way a lot.