Prior to working in programming (still in college, but I've done a few internships) I worked restaurant jobs--prep cook, dishwasher, busboy, etc. I'd come home from those jobs and not want to do anything for the rest of the day. It was completely mentally and physically exhausting.

Now I'm working for a software company and get to sit in a chair 8 hours a day and take breaks whenever I feel like it. When I worked at restaurants my managers would be all over me if I wasn't moving around and doing something.

Working in software I'm basically paid to do what I would have done in my free time. I find that pretty remarkable.