The clutch doesn't wear only if you have it fully depressed, which most people do not do at every intersection. You're wearing your clutch riding it.
Why you're sitting at a full stop with the clutch depressed anyway is a mystery in itself.
Of course, don't ride the clutch. But sitting at lights or a stop sign or traffic then foot on clutch and car in 1st is fine.
Riding the clutch is keeping it at or around friction point and using the 'go fast' pedal at the same time