Yeah you're right, didn't realize how much cap these things are (gosh darn these 5fF MOSFETs I'm used to... need reality check once in a while) they're in the 1E-9 range, thus measured in nF. Now you have 8 of them in parallel, so it's on the order of 1E-8 farads (I didn't include miller effect, which would basically double this). Your resistor is 1E4 ohms => RC constant of 1E-4. Looks like switch-on times on the order of .1 milliseconds, which is probably OK for automotive purposes.
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