Personally, even if I had absolute confidence in the security of my account (I'm careful but not naive or arrogant enough to ever say about anything "it could never happen to me"), I'd still use the OTP for the free teleports. I use them several times every day.

If I'm in Grid or Uldah and want to get back to Limsa (my free tele point), I use the free tele. If I'm out in the field and want to get to any of the cities cheaply and quickly, I tele to Limsa and then airship if needed. Even if I'm in Limsa but not near an aethernet shard (like at the ARM/BSM guild or out near what used to be the MRD guild ship), I use the free tele to easily access the aethernet and get around town. Easy, fast, free access to everything I need and it's made me lazy but I love it <3 OTP user for life! For the record though, I've been using my token since Sept 2010 and I do strongly advocate the security of the system so long as you don't digitally store "spare" numbers (as some people do to deactivate their token without using the deactivation code) or the deactivation code itself on your computer or other digital devices. Once people store those numbers on the computer, it defeats the purpose.