Ok too bad I was late for the party.
Until the person behind me is stopped = in gear. Short light = in gear.
Anything else = neutral, for a few reasons.
1) hydraulic systems don't like to be 'held down' like that for long periods. I.E. it's better for the slave and master cylinder
2) the throwout bearing wears out faster if it's in gear but clutch is in
3) it's just easier.
1) The slave and master cylinders only wear during cycling (i.e. when they are moving). There is no additional wear on the master or slave cylinder from being held at the end of their travel. In fact, you place
more wear on the master and slave cylinders by going into neutral (because that cycles the clutch twice instead of once). Furthermore, by this logic, holding your brakes on at a stop light is just as bad since the brake hydraulics operate in exactly the same manner as the clutch hydraulics. Basically, this "reason" is simply not tenable if one has any understanding of how the clutch hydraulics actually work.
2) This "reason" has been addressed several times already. T/O bearings just plain do not fail from holding the clutch in at a stop light. They fail for any of several other reasons, but holding the clutch in at a stop light simply is not one of them. Period.
3) This is the only valid reason. It's a perfectly good reason and if it's more comfortable for you to put the car in neutral, then by all means do so. Just don't think there's any mechanical reason.
ZV