Most Adobe applications scale fairly well actually - with the main exception being LightRoom.
So your two remarks were actually both incorrect.
The video editing software (which is what I was referencing with my first post) available to me, Adobe's Premiere Pro, scales very poorly once the core count crests about 6 or so. The same is true with Photoshop, but I use that infrequently, so my core count might be off.
I know how to watch resources with iostats at the UNIX level. When Premiere is running (slowly), the CPU load is between 25-50%, and nothing else is happening on the machine. In other words: it's not waiting for disk I/O or anything like that. The only conclusion I can draw: Adobe didn't do a decent job of threading the application such that it could keep the 12 real (24 v) cores busy enough with work.
jas