I am a huge fan of planted tanks. I have more species of plants than I do of fish.
I think most people start in the hobby without any help--or bad advice from the uninformed. They try plants with high lighting needs using a stock strip light and bulb, and get depressed when the plant dies. People who start slowly and have guidance from experienced people will have better success. Plants are cheaper than plastic--I can split a crypt and have 3-4 more plants. Try that with plastic! I don't have tons of light, I fertilize haphazardly. I vaccum the substrate deeply and regularly. Heck, I still have a UGF in one planted tank. And yet, everything is growing. Not superfast, but growing. I know I can't support swords, so I don't get them (except one melon, which is a dark red freak--not sure why it hangs on!), I stick with low light bunch plants and anubias (I have 4 species now--two are blooming), or crypts, which I haven't been able to kill yet.
To me, the rumors of planted tanks being hard is along the same lines as saltwater being so hard...And probably spread by the same people who haven't done either.