This, I think, is a fallacy:
If you test every class, every method,
your current release will take longer,
possibly much longer.
Testing - especially Test First - improves our flow, keeps us in the zone, actually speeds us up. I get work done faster, because I test. It is failing to test that slows us down.
I don't test getters and setters; I think that's pointless - especially since they're auto-generated. But pretty much everything else - that's my practice and my advice.