Many drives park their heads, though mostly the slow "green" types in the 3.5" size. In modern HDDs, one reason you don't get head crashes from bad shutdowns anymore is that the permanent magnet for the armature pulls it off the platter. If it's on the platter, power is being used to keep it floating. If power is removed, it flies off the platter before the platter can slow down enough to not give it an air cushion. So, the "green" style drives (not only WD's, they just used a delay that happened to mess with fixed Linux timer values) use fast head parking as one of their tricks to lower average power use by a little bit.
With one drive, I wouldn't put much stock in any reliability. Almost all of them will last 3+ years, with some small % dying very early on. The chances of non-infant failure too soon with any popular drive are pretty slim, even if you could assume a substantial difference between brands, and bought the worst of them. On the other hand, it's also sufficiently unpredictable that, if worried abut uptime or your data, backups and/or spare drives are the way to go, rather than hedging your bets on reliability of a single storage device.