You can fight rain and cold, but you can't fight being soaked with sweat after the commute.
I always had to allow an extra 15 minutes in the day if I was riding the motorcycle to work. I would walk to the car, jump in, turn the key, and I'm off to work. Pull up in the parking lot, jump out of the car, and go.
But with the bike? Get out into the shop (the bike's inside, the car is not), CHECK THE TIRES ON THE BIKE (no good checking them the night before), get into the jacket, put in the earplugs, pull on the helmet, pull on the gloves, roll the bike out, close the door, and NOW I go.
At work, take off all the gear, put it away in the panniers, lock it up, and THEN into the office.
Reverse order when going home.
I usually rode anyway, but it was no timesaver, and with the price of tires these days, and me with a car that got about the same fuel mileage as the bike, it wasn't a money-saver either ......