When I do anything on my .wav software or Audacity I have often looked at the screen to pinpoint the start or put in a small noise just milliseconds in front of the track and then delete it out.
I often like playing the overdubs all the way through a song.
But some arrangements can be trickier then others.

It gets too stiff and mechanical sometimes with click tracks because it gets too rehearsed.
And there does need to be that reference point.
I like to play behind a rythmn often too so there is not so much tightness.
Most like to be ahead in the count or right on it.

http://www.f3music.com/444