At 6' and 142 lbs I look similar to Rassmussen, minus the spots and shades. And older of course.
I usually do 2x/wk in the off season and 1x/wk the rest of the year, with a month or so off when I'm building for a peak and want to use all my energy for riding.
I find that when I stop lifting I feel weaker over all. Lifting doesn't make me faster it just makes me feel better. At one point in my 20s I was lifting for 2 hours 3x week and got pretty strong for a skinny freak, but it didn't make me faster. Or bigger- I weighed 4 lbs less then.