First, check the essentials: Are you sleeping, eating decent food, and exercising regularly? If not, you may be neither burnt out nor lazy. Take care of this stuff first. Second, have you spent the last year working so hard that nothing short of a physical illness will make you slow down? Do you regularly push through problems with sheer willpower? Do you crave the next "green" unit test result beyond all sanity? If…
What you describe there is laziness. Burnout is this weird concept that developers have invented to describe "I can't be bothered to keep going". 5 years, no days off, one 5 day holiday per year, on call 24/7 for the duration, and I'm just fine. Depressed and exhausted, yes, but the work keeps flowing in and the code keeps flowing out, which is all that matters. I guess what I'm getting at is that people have forgott…
As you get older and/or start a family, the thought of 80+ hours a week becomes laughable and even dread-inducing.
If work is hard, I'm probably going to look at a different career. Hard implies suffering and unpleasant obstacles to me. If it's challenging however...