I did chuckle at the idea of them being called Lexus lanes, lol.
Would you pay to use these lanes? We do a 230 mile trip most Friday evenings throughout the football season, and 230 miles back at some point over the weekend. And yes, I would gladly pay if it meant we weren't sitting parked on various bits of the M25 and M1 for several 10/20 minute sessions.
I would hope though that if some people pay to use the toll roads, the existing roads would be less congested for drivers who opted not to pay.