I've noticed our MD is red hot on getting players counting, including one exercise where the players have to count silently, then come in together on a single note in a bar, which changes from one bar to the next. Any miscounting or errors in tempo on their part show up immediately. He also regularly has them playing a piece out of the Red Hymn Book - but playing the whole piece in quavers. Again, any errors in timing show up straight away. The point, he tells them, is to get them to count in quavers, even if they're playing crotchets, minims or semi-breves - as he points out that this won't just help them to come in on the correct beat after a rest, but also to get the note lengths accurate. It certainly seems to work.