I have found that when you meet crew with whom you have flown before, they usually go out of their way to look after you, and it can make for a fantastic experience. Last week I flew from LHR to HKG with a crew member I had flown with from HKG to NYC a couple of weeks before, and before she came to say hello she had already put food aside that she thought I would enjoy based on what I had eaten on my earlier flight. It certainly wasn't necessary to do that, and I am sure they had more than enough food on board, but it is demonstrative of the effort made. When flying with a YVR crew more often than not I will have flown with at least one of the crew members before, and they seem to really appreciate it and make more of an effort than normal. It matters that I have flown with them before only to the extent that it can make a good experience even better.