Absolutely worth it. I have a 2012 i7 (2.6) Mini Server that runs headless with 2 attached Drobos.
I have scripts that run Handbrake on the ATV3 preset, tag and copy into my iTunes library. Pre Arctic Silver, I would throttle at 99C after 2 minutes. Post Arctic Silver, I hit 97C and never throttle.
Ambient temp is ~76F, the Mini is on a mStand from Rain Design to ensure airflow.