One must always listen to the click and ensure that one is in control of the accents and in tempo. One must know the song well enough to listen to the click and not concentrate on the actual content. One should never just listen to the accents and ignore the rest (pretty much); continuous listening is required. One must always be conscious of the click's presence and keep it in mind. Most importantly, one must concentrate on the click. One sees awesome musicians grooving and looking really cool while playing in time; they've either just gotten used to high concentration levels or are hiding their concentration. With these three simple steps conquered, one can effectively play in time (pretty much).
However, the most important part is practise with a click track. A person who has recorded before will be much more at ease with a click track that someone who hasn't; and someone with a decent level of experience will definitely be better at staying in time.
And that concludes my preachy seminar. I only wish i were good with a click track.
PS: Good Love Is On The Way - John Mayer Trio.