Yes, I'm with Ian here. If I know it's going to rain then I'm quite happy to put the hood up, but if I'm caught out, then I just crack on.
If it's a passing cloudburst then I'm happy to pull over and put the umbrella up if it's feasible. Occasionally, like last Bank Holiday Monday, I get caught on a Motorway with nowhere to stop then it all gets a bit daft, but it's only rainwater after all, and one can soon dry out.