I used to be super stringent about doing tags in order, but loosened up a couple of months ago and started bumping threads I'm excited about up the queue. I find I get back to the majority of my threads at the same rate or more quickly than when I was being rigorously fair, even alongside the threads I do first.

It just comes down to good motivation. You get momentum going with the threads you're stoked on, and it carries forth to the ones you're more neutral about.