The dramas that I see everywhere, but didn't watch because either I can't bring myself to watch them or simply because there are tons of newer dramas I started watching, are: Stranger, Signal, Hana Yori Dango, Full House, Romantic Doctor, Teacher Kim, Moon Embracing the Sun, Eternal Love, Mother and 1 Litre no Namida.
I have seen a lot of dramas you've listed, and I would say that Healer, Moon Lover: Scarlet Heart Ryero and Kill Me, Heal are are probably some of the best dramas I've seen. I did also thoroughly enjoy The Master's Sun and Fight for my Way. I did like DotS (but this one is not for everyone) and The Korean Odyssey. YWCFTS, Secret Garden, Coffee Prince, Reply 1997, Hwarang, Oh My Ghostess, BoF, and the above-mentioned Goblin were ok, but not really that great (my apologies to the fans). I felt like they all were a bit overhyped. I dropped Doctors because I didn't love the story or the leads together.
Personally, I would actually recommend staying away from:
- Cinderella and the 4 Knights => This show is just not only full of really dumb cliches, but also not that interesting. It also has one of the most stiff second female leads in the history of kdramas, and generally lacks direction. It's fluffy and that's it; it's not even that cute. The evil step- sister and mother got on my nerves, too.
- Uncontrollably Fond => I actually did get into the first 12 episodes, but everything after that was just an epic fail. The character's decisions stopped making much sense to me, and the story was repetitive. I also didn't like the ending.