Please, if you are the last person to join a Raid group, please proceed to the raid even if you do not have ship buffs. There are few things more annoying than waiting forever for a Raid to fill, then, when the last person finally joins, they say: "Getting ship buffs then omw.". Raids have been getting completed for a long time before ship buffs were introduced and, as important as your toon is to the Raid, having one toon out of 12 missing ship buffs will not affect the outcome.
Likewise, if you are in a Raid that is waiting to fill, please do not wait until the very last slot is taken and THEN ask for ship invites or for buffing at your own ship. There is no need to eek out every available second of ship buffs for a Raid that is going to take anywhere from 20-40 minutes.
Thank you in advance and have a nice day.