crowns are referred to caps by most lay persons. should not be painful. only thing that might be a little inconvienent is that you have to come back to get it cemented once it comes back from the lab.
cad-cam crowns are nice since they only require one trip to the dentist.
one thing to consider is that if you're thinking about bleaching your teeth, bleach them first and then get the crowns done as the crowns are not affected by bleaching strips, trays, etc.
feel free to pm if you have any other q's.