I'm not really at my best, unless I'm flying at least once a week
The higher the level of skill that you have, the less practice you will require, to maintain a basic level of skill.
I am sure I will be attacked for daring to opine this, but in my experience it is the low-time and older pilots that need extra flights. If you're 40 with 5kTT, you won't need much recurrent training to stay safe. But if you're 20 with 100 hrs, or over 70 with a gazillion hours, you're probably going to benefit from extra flights. For very different reasons.
I have long maintained - again, attack away - that anyone with less than 1kTT needs to fly twice a day, wx permitting, to develop their skills and experience. It has been my experience that by the time someone has 1kTT they should be reasonably proficient - the learning curve is starting to level off - and by the time they've hit 3kTT they've shown you what they've got. The curve is flat, and extra hours don't really help a whole lot past that point, if you're doing the same thing over and over again.
I would not state that a 20kTT pilot is twice as good as a 10kTT pilot. In fact, as he ages, his performance is going to decrease. He was probably at his peak in his mid-40's with 10kTT. Once you get into your 50's and 60's your physical performance simply isn't what it once was. Mind you, you can still be a damned good pilot at 65 and 30kTT, but you probably won't react as quickly (or as well) to a new, challenging situation as when you were 40 with 10kTT. Fact of life.
Personally, I like to fly every day to stay sharp. Two or even three flights a day - preferably in very different types of aircraft - is even better. And they don't need to be long flights - I often fly 15 minute flights which are very busy and challenging, that leave me drenched in sweat at the end of them. You don't need to spend hours and hours on autopilot, even though I guess it looks good in the logbook, it really doesn't help much.
Crap away from a great height.