There are those who log sim time and those who don't. Personally, I log all my sim time, even now at the airline. I do it mainly because I believe the FARs require logging of sim time under FAR 61.51. A pilot must be able to show training, qualifications and currency for the ratings, licenses that he/she holds. It does say that each pilot must do this in a method that is acceptable to the administrator in part (a) but then goes on to explain in part (b) the required information in logbook entries to comply with part (a). This information includes not only flight but time in, type and location of a flight simulator or training device.

For me, being type rated in different aircraft, I have logged the initial training for each type as well as my recurrent annual simulator training. Based on my interpretation of the FAR, this shows that (a) I became qualified through the appropriate training and (b) I stay qualified through the required annual airline simulator check-ride process.

Just my opinion though.