I don't know if I agree - I did my first planted tank concurrently with a 'non' planted tank... and it's addictive. It takes a lot of research, keep reading - I spent a month planning out my first tank, ordering the light fixture, and all the 'li'l' details before I set mine up.
The first month was extremely trying - the things like algae - it's expected to happen - and, beleive me - it does! and, for someone new like me - I was so worried - but, the comments I got from other el natural forum members was that I needed more plants to make competition for the nutrient levels in my tank. And, the whole process becomes an experiment.
Im 2 months in now - and, addicted to the whole process. Is it more work? to begin, yes. But, after a while, once you get the process down - and, the plants respond to your method - you find you don't have to do any work ... most especially on the larger tanks. My first 20 gallon is due a 20% water change - My 30 gallon tank is 1 month along - and needs a 15% water and a wash of the floating watersprite because the algae in it is becoming rather unbearable. The 2.5 gallon tank really needs to be moved away from the window - I have it on a weekly cycle to remove 70% of the water - although, I skipped last week because I knew that I was moving Galahad out of there. - The 20 gallon long that I set up 3 weeks ago? - well, I need to do some chemistry tests on it and see how my levels are. If it's ok and it should be, because I began the tank using a 'used' filter - then all I'll do is top off the water. and, my newest tank, the 15 gallon that I set up this weekend? - I won't have to worry about doing anything to it for another few weeks - except find some more plants to put in it.
5 planted tanks? and only 2 months in? ... how crazy is that? :) But overall - the ease comes from not having to do massive water changes unless there's a major clean-up issue. The fish poop? fertilizer.
The non-planted tanks will always have the same cleaning schedule. You change the filters regularly. You siphon, and/or wash the gravel. You change the water fully or partially as part of a weekly routine.
The planted tanks, once settled and running smoothly, just aren't this schedule driven.