I rarely look at my Next Actions.
I've been using GTD to various degrees for many months now. I store all my Actions in my Treo 600, which is convenient for me. I use my tickler well enough, as I can remember to check it every day when I get home from work.
I do the weekly review about half the time, and my Next Actions lists are always acceptably up-to-date.
But I rarely look at my Next Actions. I rarely even think to look at them. I'm usually enjoying or doing other things that aren't on my NA lists.
Any suggestions? I'll happily provide further information if requested.