Riding is just so much faster, I have a ~4.5 mile commute each way and it takes me about 14-17 mins including stop lights. The bus takes 30 mins or more (I've ridden a bus maybe 50 times in my entire life) and by car it's probably 20 mins or more.
I am just fast on the bike. I'm riding a cheap $150(new at store) commuter that weighs like 35lbs, 700c rims and still manage to do ~25kph average (~15.5mph) including all stop lights and A LOT of traffic causing me to stop frequently. I'm guessing I'm doing 29 moving!
On a road bike I was a lot faster too. Get off your ass and ride, more people should do it.
My co-workers all look at me like I'm an alien, no one who can afford public transportation/a car would ever ride a bike in a third world country but hah, the joke is on them. They're miserable when getting to and from work and I'm all-out sprinting grinning like mad.