Yes- but it's still twice as fast mate, and it'll feel twice as fast if you ride them back to back. In fact your Fazer can do 0-60 in under 4s, and I doubt that any bike without a drag style lengthened swingarm could do 0-60 in sub 2.5s without looping, so the difference up to 60 is less in time terms. Just had to question your logic on mathematics grounds.
All the practical advice has been done and dusted here, I reckon, so I'll chuck in my anecdotals. I passed my bike test before I passed my car test, aged 17 1/2- I got stiffed by the new rules; because I did my theory test late I ended up with a restricted licence despite passing my practical test in 1996. It was more or less irrelevant anyway as I could never afford a bike after that.
This year though I got a new job driving a bus that pays well but requires me to commute 10 miles at all times of day depending on my shift. A bike was the only sensible option, and I needed one in a hurry- so I headed into the nearest showroom and ended up with an ER-5 like Agent's, only a fair bit older and crappier. Cost me £850 with a brand new, fairly decent Arashi helmet. When I collected it and rode it home it felt like a rip-snorting beast, and handled rather frighteningly- which I soon realised was because the front tyre was drastically underinflated- they told me they'd serviced it before I bought it. A quick detour to a garage had it up to 28psi from 8psi which sorted the handling- but the power was still a bit frightening. By the end of my first commute though, I was fairly used to it- which I reckon is where the problem lies. You very quickly adjust to the sensation of speed whatever bike you ride. In my experience it's not true that any given speed feels faster on a bike than it does in a car- I find it genuinely difficult to stick to 40mph on the bike in town now, let alone the 30mph speed limit. I have to be disciplined. My quickest commute- 10 miles, all 30mph limit- was 16 minutes (at 4am in the morning, I hasten to add).
I'm lucky- when I was 13, my mum was kind enough to buy me a moped to thrash round my grandad's field, so I learned about handling a bike in a safe environment (was also a keen mountain biker in my teens/early 20s). The other day, heading into a roundabout which normally never has anyone on it, I had to haul on the anchors because a taxi was joining from the right. I would have been fine, but there's a zebra crossing on the entrance, and my front wheel locked up on the white paint. Pure instinct kicked in, and I was off the brake and on again in time to come to a halt about a metre from the taxi. Had I not had the bike handling experience, I'd have been off- or worse, under the taxi.
I don't want to put anyone off- I've loved bikes since I was 13, and I'm really glad to be back on one- but they can be dangerous, and the biggest killer of bikers is overconfidence in their own abilities. Do it- but be careful.