Not sure that in the UK we are being legitimised, we've always been allowed (even if not necessarily riding legally
). We are still charged tolls on many toll roads, there are not that many motorcycle-specific parking places, no longer free parking in many cities (including London), though charges are often much less than for cars. As an aside, even where there are m/c specific places, they are not signed on entry to a car park, many times I've parked in a car bay, only to walk past a m/c specific area nearer the entrance to the shopping centre or whatever.
The biggest difficulty in getting onto powered two-wheelers is the obligatory training and testing. Every few years the requirements for getting a motorcycling license get more stringent and inevitively expensive. There are many experienced and reasonably competent motorcyclists (including me) who will tell you they couldn't pass the tests that newbies have to. [rant]Without trying to get political, most of these changes in the law are being forced upon us from the European Comunity law creators, regardless of our own requirements.[/rant]
Car drivers are mostly unaware of motorcyclists, but generally won't get in a tizzy if passed by one, whether on the open road or from filtering, the contribution to reducing congestion seems to out-weigh any jealousy. Or they are too busy on their phones to even notice the motorcycle.
Officially, motorcycling is quietly encouraged (apart from the test requirements) but there are stupidities. For example, generally bus lanes can be used by cyclists and taxis, but not motorcycles. One reason I've seen given? "Because pedestrians won't be expecting motorcycles in a bus lane."