I only use TMW with timers overlaid for tracking procs and since the change to 10 sec durations its much easier to track stacking trinkets like Wushoolay. I have a very good memory of what's proccing what was last procced when trying to decide to snapshot or not. Using my peripheral vision I can immediately see what's come up and make a decision based on that.
Casting once procs happen is important but even more important is the snapshot right before your trinkets/meta/lust are about to fall off. Especially on the pull: BoH, Wush, Meta, Hero all up and AT w/ 6 secs left on trinkets - snapshot - AT takes you back - reapply bomb right before trinkets and meta fall off.
Edit: some of my trinkets have the int value on the TMW icons.
Edit: also on my ipad and don't feel like typing out a whole scenario but you should be able to tell what's going on