Hmm.... You're not writing long articles on PM just to avoid work, are you? ;-)

I think your issue is shared by many. In my own case, what helps is knowing what my "avoidance behaviors" are. For example, I make short to-do lists (8-10 items) to organize my work. A sure sign of procrastination is that the bottom few lines -- which tend to be less important but easy to do -- get crossed out first. When I see that, I realize I have to muster the energy to go after the top lines. It doesn't always work, but it usually helps.

So I'd say the first step is to become aware of what you do to get an "instant gratification" charge. The second step is to figure out how to change those behaviors. Again in my own case, I think it's fine to sometimes indulge, so I set aside one morning a week (more or less ;-) for fun, small items. It's a lot easier to gather the energy to go after the dreary stuff when I know I'm going to have some fun later¹.The trick is to strike a balance that works for you.

Yeah, all of these require some level of determination and will power (or "won't" power). But you already knew that. ;-)

¹Hmm... Delayed instant gratification? Is this an oxymoron?