Yeah, it's weird. I've driven a P85D and while it's very, very fast, it doesn't feel anything like a combustion engined car with 600+ horsepower.
I mean, it's incredible off the line - all wheel drive, no feeling of the drivetrain struggling to transmit the power it's being asked to, no sensation of the tyres struggling with a sudden burst of torque, but it's not scarily fast. The lack of noise probably has something to do with that, but it must also be something to do with the way electric motors develop their power and torque, at low motor speeds rather than high ones. And obviously, the gear ratios of regular cars.
The average (petrol) internal combustion car accelerates faster the higher it revs. The Tesla feels very rapid indeed up to 70 or 80, but while something like an M5, E63 S or Panamera Turbo S would be in the meat of its power band in probably third gear and feeling ridiculously fast, that's where the Tesla tails off. You can see that in the Turbo S vs Tesla numbers posted in that thread - below about 100 the Telsa is either quicker or largely as fast as the Porsche, after 100 the Porsche leaves it.
All that said, the way the Model S moves is still remarkable. In terms of pure roll-on acceleration, most conventional performance cars wouldn't see which way it went, and you'd have to be revving the average turbocharged V8 like a complete fanny to match it. There's something hugely satisfying about the un-shouty way it goes fast. The excitement of noise is all well and good on a test track or drag strip, but on the road you ideally don't want to call too much attention to yourself when you're accelerating hard.