Fellow nutter here. 100-150 miles a week (depending on group rides). I'd been off the bike for about 8 years but picked it back up in March.
I'm riding a 2012 Time RX Instinct with added DI2 for fun. I got the bike back when it was new, but put off riding it until earlier this year. I'm less about pushing my body to the limit than eating a huge plate of miles every day. For fun I do group rides with a bunch of tech industry folks who commute from San Francisco down the peninsula to various points, mostly Mountain View.
We've got lovely views up here:
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But I mostly see'em at speed.