Yes, I've seen a number of stations with new ramps, some feel like they are miles long to be high enough to go over the tracks (for crossing platforms or exiting from different sides of the station).  

If you are getting about by yourself it is hard work in a wheelchair but it also doesn't help those who can only walk short distances.  They are more helpful for buggies/suitcases with wheels than for disabled people.  But it is better than no access at all.