Funny, I did not find the flight model in DCS to be that much different than AH. Ground handling is harder, as it is more realistic for tail draggers. While flying, some attention to engine management is needed, but it mostly boils down to setting manifold pressure and RPM to constant power settings, again more realistic.
The learning curve can seem daunting, but you don't have to learn everything at once (small bites). The sim can start the aircraft for you step by step, you can "hot start" with everything already running for you, or even "air start" where you are already in the air. Whatever aircraft you want to fly there is a wealth of YouTube tutorials, forum tutorials, and manuals to learn every aspect of the aircraft.
I have the P-51, Spitfire, P-47, Mosquito, and I-16. I have not even touched the German iron yet.
I found the player numbers misleading in DCS. While finding servers with 30+ players is common, that doesn't tell the whole story. The majority of DCS game play is PvE. The A/I of both air and ground units are much more capable/realistic than in AH. More importantly the A/I maintains a "warriors" attitude. It does not constantly run away from fights when it does not have vastly superior numbers. This player trait (outside of Monday Night Madness) was the main reason I stopped flying the MA. With A/I, the numbers in the servers are two to three times the number of human players. The combination of human and A/I means the fights are not hard to find while still being challenging. It also means there is always a fight available 24/7.
I was a devout AH member for 20+ years and it did feel like the end of a marriage when I quit. I am thankful to HiTech for the fond memories. That said, it is refreshing to have a sim where the developers post WEEKLY news updates and meaningful patches once or twice a month.
DCS has one of the best free trail programs. The base game is free with several aircraft and maps. Do a search on "DCS A-4E Skyhawk" and you will have an unlimited, completely free, sim that will allow you to explore ALL aspects of what DCS has to offer. The A-4 is an early jet. Learn it and you will be setup for either WWII or modern jets. It is full fidelity, and is COMPLETELY FREE!
For me to spend $180 a year on a sim, I require more value than AH is currently giving. Everyone is different, my point is that there are alternatives out there that will cost you nothing, but your time. Don't be scared.