I've recently started taking it and I've definitely noticed improved cognitive function. obviously all anecdotal and likely other contributing factors too (have been exercising more)..

More water in the muscles is another effect. Also placebo. I do notice I'm a bit heavier when I'm on creatine.

Creatine is known to give you some more energy. Like, 3%-5%. That's just an extra rep, hardly noticeable.

And extra rep seems like it could be a big deal when strength training.

Yeah, sure.

The point is that it doesn't work like those Witcher potions. Nothing changes here and now.

I wouldn't say hardly noticeable especially for experienced lifters. After training for a few years those extra reps and slightly more weight have compounding effects over time.

True. What i am saying is that one has to have a good feeling of what this extra rep is like.

Personally, i only saw that it works over time because of my journal. Most people dont do records.