I remembered my big ring today - I used to only use it for significant downhills, but today realised that if I'm doing 25 in 8/2, switching up to the big ring and spinning just a little bit faster can bring that to 30. Will use it more frequently now, I think.
I was always paranoid that I'd shift up and lose all the momentum in my legs by having to drop my cadence to 30rpm.
Plenty of other cyclists, too, it felt like London... in winter. Some other roadie came up behind me and challenged me to a race, I tore off at about 30mph ;o left him for dead. A decent tailwind helped a bit!