OK, going out on a limb here - - -
IF the "photo bug" from the film days refers to the struggle to get well exposed/balanced photos,
IF "blending and layer" means combining images (versus the wide exposure range of High Dynamic Range photography),
IF "exposure on the sky blended with this other pic" also means combining images,
IF RAW is attractive because it gives a lot of control over color temperatures, exposure, burn/dodge, etc.,
THEN Photoshop Elements($60) will get it done easily. It can manipulate your color curves, brightness and contrast, shadows and highlights, transparent layers, dodge and burn, and much, much more.
Other programs Will do all these things and more as well, but if you bought a Sony 'cause you "... have more money than willpower", you should consider the ease of Elements versus the others. If you want to spend more time hiking than post-processing, you should consider the ease of Elements versus the others.
If you work your way through Elements and find it lacking then you can spend the big bucks and the massive amount of time required for the others. And what you learned in Elements will apply to Photoshop or Lightroom.
Apologies if I'm reading too much between the lines.
[.... and, I know nothing about the Mac world, except that there are a gazilllion apps out there, and one might do most of what you need. Define that need, then post a query.]