Separated bike lanes ("cycletracks" is the buzzword here) are great.
Separated bike lanes are a total nightmare. On a major arterial route where there is no more than one junction every 3+ miles then they're great for the very small proportion of cyclists who are doing 50+ mile rides but in towns they're a disaster. (The vast majority of cyclists don't make journeys where there are no turnings for three miles - they're going from A-B because it's just about walkable but cycling is less effort and faster)
For motorists they're a nightmare - turning left for me (right for the US) you're going to be negotiating a gap through a barrier across the bike lane - possibly with two way cyclists to look out for. As a cyclist they're lethal - it's hard enough getting drivers to see a bicycle in front of them - it's a guaranteed certaintly that they won't see you if you're in a separate segregated lane - so they'll overtake and then hook you or turn across you without a moments thought.
Unfortuately, I can no longer get google maps to work at all but try looking at streetview for Tavistock Place in Bloomsbury, Central London
Try cycling along there - where pedestrians will step out in front of you or pushchairs will be pushed out in front of you and you have nowhere to go. Where people take great pleasure in smashing glass in the cycle lane because they hate cyclists and you can't go around it.
In my 10 years of commuting from N1 to EC2A, every time a new cycle lane got "designed" on my route I had to find a new route.
Some cycle lanes are good, a very, very few. The vast majority make the roads more dangerous for cyclists than no lane.
There's a "cycle superhighway" near Whitechapel. I'd never used it - but I'd heard of it by reputation - by the number of deaths to cyclists since it had been built. And the first time I used it I had to make two sudden stops for cars making reckless manoeuvres. The "cycle superhighway" makes it more dangerous - for one thing it keeps a space (mostly) clear of cars - so when someone wants to turn left (right in the US) they can pull out of the queue and nip along the "cycle superhighway" for a dozen feet before their turn. Of course, they do this at the last minute without warning and with a burst of speed and acceleration. A bit of scratched paint and another dead cyclist.
In cities (London), mix cars and bikes together. The average speed of the cars is hardly different to the average speed of cyclists. We've just had a guy gaoled for leading the police on a ten mile (car) chase across London (starting in Farringdon) and despite ignoring signals, driving along pavements, knocking cyclists off their bikes (you can google for the video of some of his driving if you're interested) it took him 40 minutes to do those 10 miles.
Give cyclists an extended green phase at junctions - allow them to get away first - to avoid the pinch at the other side of the junction - and it will also make it easier for pedestrians to finish crossing. Allow cyclists to turn left (right for the US) on red lights but don't think building segregated facilities, or magic paint on the road, will make life safer or easier for anyone.