It is still the case, the RAP pass acts as a virtual queue pass and requires the pass to be marked with a time for next use (current time + queue time).
Quite often however the passes are just getting ticked and no time put in by the staff, which means they won't have to wait afterwards at all, which leads to longer RAP queues. To shed a bit of light on this as someone who worked at Chessington and often needed to sign the RAP passes (I always put a time), I can understand why staff wouldn't do it. For example on The Vampire, the RAP queue is managed by the 'offload' member of staff, they already have several other jobs to do (bar checks, bags, etc) and by the time they get to checking the RAP queue there is often only a few seconds to do so. Without checking with the ride operator, they do not know what the current queue time is so it is often a guess, additionally some (by no means all) of the RAP users will be abusive if the next time marked down is long time away with remarks such as "what is my child expected to do for an hour?" or being called a jobsworth or similar (same goes for over 3 people accompanying the passholder, although this is not that common) so it is understandable why passes are not checked properly.