Sammy,
heres my take.
If this is your first trip and its your 6th rev, then i would say you are itching to burn fast, bright and short. As my mom use to say, "you will learn". You wont know until you do a trip to find out if or not you screwed up (for yourself). There is no right or wrong way to travel and i bet you will find others on here that will say your 6th rev is too slow for them. But what is good for one or others may not work for you. Again, you wont know until you get a trip(s) under your belt and figure out how you like to do things. Also, there is no reason you cant mix it up either. Spend part of it running around alot and some of the trip just chillin. Again, you wont know until do you.
If you feel that this is your one and only chance to travel and want to "make the most of it" then go ahead an think that way. To me, if you want something bad enough, you will find a way to do it or make it happen. Same for this trip you have planned.
What i do is to PLAN chillin times into my schedule. I know it may sound dumb, but its the way im wired and so far it works for me. I dont have it in me to burn fast, bright for a long time anymore and life/experience has taught me to slow down and "smell the roses". Again, what works for me may not work for you.
When it comes to looking at Days or Nights and planning as such, i say again, do what works for you. As long as you understand that 3 nights equals 2 days and so forth. I dont know about you, but im awake during the day and do my things during the day and planning things during the day, so for me, i look at days. At night im sleeping (hopefully). What also i do is to print out a calendar and mark it up to where i want to go and so forth.
as far as where you want to go/visit, i have to say that i havent been to any of the places you want to go except Munich.
At Munich I allocated 3 full Days and that included a side trip to Dachau. The 2 days in munich was for the things i wanted to do/see so what i may like may not suit you and i could have spent 3 or 4 full days in Munich too. The Dachau trip took almost all day and even if it didnt, my mind was wasted by the end of the tour. Afterwards i spent time reflecting on that and just chilled. Same for Auschwitz-Birkenau.
I plan/wanted to do Italy and Greece next year along with other places. Rome and Venice along with Athens was in my initial plan. However now im dropping Venice and sticking to Rome and things south of Rome and also dumping Athens. My current plan is 3 full DAYS in Rome and with day side trips to Pompeii and Herculaneum and maybe some more. I know that 3 full days in Rome is still short for what i would like to do/see, but for now, its whats i have planned - my rev #2.
However your trip ends up and what rev you decide to go with good luck and happy trails.