Hi Loukas, you're right that it does sound daunting when looking at all the screenshots. In reality, this helps me spend less time on the planning and more time on the doing, which is why I made it in the first place.
My monthly plan + reflection takes about one hour
My weekly plan + reflection takes about one hour
My daily planning + updates takes about 5 minutes.
As for complexity, it's less complex than it looks. Half of the stuff you only use once per month. Some you just copy over from the last month. In the end, it boils down to the things you mentioned: a daily and weekly plan, and a journal.