Good point, Greg. People slow down because they are not used to the change. After a few years (at the most), they are back to their previous attitudes and behaviour. IMO / IME.
I do also agree that life is slower, more relaxed and more enjoyable cycling without traffic. For those people who don't know Franklin from Pidd, the book can come across as a set of intimidating rules which could, again IMO, put off more people than all the cycle paths of Bracknell.
I think that this is an important point as well. Many have spouted entrenched positions and long-held opinions as cyclists about what they feel needs to happen for them to be happier cycling on the roads. To get an increase in the number of cyclists, we first need to get the non-cyclists into a position where they feel they would be happy cycling. Whatever else, cycle routes / paths / lanes do give the perception of a world which cares about cyclists and they are, IMO, useful to encourage people to take their first steps. Which, I think, harks back to the OP.As a Swindon cyclist I do not use the "cycle lanes", although they are not cycle lanes just shared paths, some with a white dividing line and some without, that vanish in the town centre. When I started commuting I used the "cycle lanes" but that was due to not having the confidence to ride on the roads, not many cyclist's on the roads a few years ago. Having become accustomed to riding on the road, using the "cycle lanes" feels very strange and I feel less safe.
I do also agree that life is slower, more relaxed and more enjoyable cycling without traffic. For those people who don't know Franklin from Pidd, the book can come across as a set of intimidating rules which could, again IMO, put off more people than all the cycle paths of Bracknell.