I have a full PPL and do think that the requirement to fly with an instructor every 2 years is a bit onerous. Its maybe OK if you only fly 5 hrs a year but for a high hours pilot it doesn't provide much value.
In my case I fly 75-80 hrs per year in a 200HP single seat aerobatics aircraft. This year I had to find the cheapest dual seat aircraft for hire and fly an hour with an instructor. It cost me about £130 and was quite pointless.
Perhaps we could have a rule that only requires the 1 hr with an instructor if you have flown less than 25 hrs in the past year.
ZA