It all depends on what your plan is, Headhunter. I currently keep a log of my lifts, but there is nothing complicated about it. I just go into the gym with a goal in mind, bang out my goal, and then when I get home I make a note of what I did in my journal.
I don’t do any Excel spreadsheets, nor math in order to drop volume and increase intensity in the weeks leading up to competition, I just keep this concept in mind and do about 2/3 the work - I prefer to drop volume, not intensity - so I do 2 / 3 the number of reps I normally would -on ‘deloading’ weeks every 5-6 weeks or so. Oh god, the number crunching that I must go through! (Instead of doing triples I do doubles. Instead of doing 3 sets of doubles I do 2 sets of doubles. Either way, it’s not exactly complicated.)
After a competition, I pretty much stop keeping a log altogether, and just work on high volume with assistance lifts like 5-8 reps, sometimes even more. I stick to doubles and triples with the olympic lifts and never take it to failure.
I’m not really periodizing my programs in a quantitative manner at this time, it’s not worth the effort since I feel I am still building a ‘base’ of technique and will be doing so for a long while - at least another year or so.
This is on the ‘Bodybuilding’ section of the site, so all in all I think your statement should ring true for the majority of guys on here that are just trying to look good nekkid. Obviously, if this is the case, judging yourself by appearance or with calipers is often the best course of determining what the weakness in your chain is and doing what you need to in order to achieve a goal.
Bottom line is this: It’s important to have specific goals and plans, and that is all for the majority of lifters on this site. So I agree with you to an extent, but when competition is a priority for you then you should at least take into consideration the big picture aspects of periodization and apply them to a group of exercises that work best for your goals. That is all.