I don't think any of the guys with old school equipped engines do run one, me too not. Perhaps some of the modified ones with some modern builds...
I heard of these discussions, I have a 2013 Hemi-Challenger R/T as a daily and read some threads about it. I think it makes sense for those who drive their cars only for a short period of time on good weather. But since I use this car every day on summer and winter and drive 30 - 40 miles minimum every day I found it not necessary because it is heated up well every day. I deactivated the Multi-Displacement-System though, I always run on 8 cylinders. My oil still have some goldish color after every 10.000 miles so I think that there is not much gunk left underneath the intake. I don't care...
Just my 50 cents on this topic :beer: