How do you experienced commuters deal with the rain?

What do you wear or take with you to accommodate the rain?

Do you carry a laptop with you? I have what is claimed to be a watertight pannier system, but that accountability is high.

Anyway. It just feels too difficult to start out in the rain and expect that the ride might continue for the full commute.

My commute is 3 miles to the bus stop; a 30 min bus ride; and then another 45 minute bike ride. Sounds ludicrous to make that a standard plan. Despite the rising gas prices.

Looking for your feedback and input.