Trying to learn a skill just for a specific task has given the world many oddities, including the Witch of Maria Agnesi.
I started with CC3 and now play with PS for some maps...I personally think the learning curve ascribed to CC3 is a bit overrated - there are some really great tutorials on youtube (particularly the ones for dungeon mapping) that really help you learn the basics).
I also think that the two programs are useful for different things. I've found that making dungeons or structures is FAR EASIER with CC3 - largely because drawing outlines is simpler and you can just drop in objects. You can do it with PS but i've just found that it takes me twice as long. On the other hand, PS is infinitely better for doing big scale maps (continents, cities, or villages) or any map where you want to display elevation (mountainsides or hills). There are some work arounds in CC3 but ultimately it doesn't have a "multiply" layer style (though I think they might be trying to add that in for the new version of CC3+)
*Most of my Maps can be seen in full resolution on my blog*
*I've made some of my maps into full adventures available for download at DriveThruRPG.com*
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