Not true anymore, for long time actually - surely for 10.8 and 10.9...
1. I have FV2 enabled - and if I travel (especially fly) I enable firmware password. Makes computer useless for anyone (except NSA and similar "friends"). If stolen, chances of misuse of my private information is small.
2. Time machine saved my butt multiple times. Recently I "improved" somehow OS disk (don't ask...) and Time machine recovered me back to my pre-improvement state within ~6 hours. And many times it allowed me to find my years old documents which I needed (I have few TM disks, one going back to before 2010). Great piece of mind.
I tested speed hit on FV2 and it is not excessive - with SSD it is measurable, but not noticeable in real life. IMHO, any Mac notebook today should have FV2 and TM used, they are convenient, reliable, and add functionality 99% of users needs (even though they may not - yet - realize it).
Spoken as someone who had one notebook stolen from locked car (hidden in trunk) and at least 3 hard drives died in the last 5 years (I do have number of computers in my care).
Experience : TM + FV2 = relatively easy recovery from disaster
Even better : TM + FV2 + recent CCC clone = in operations in minutes