Manual transmission shifting on the Rocket vs other bikes with smaller engines

Only a little. The R3 has such a wide powerband and so much torque available at all rpms that its not necessary to shift as often, especially when it will reach 55 mph in 2nd gear with no problem.
 
I would not regularly start using 3rd gear. I like shifting so I use them all and depending on moods will shift early for lazy cruise or near rev limiter for thrills. I think the motor likes to be above 2k for best operation.
 
Naw, not really. My 2nd R3R, YurMama, has been breathed on with parts from the "tin shed" and a Rob Claviger build of 200+ whp.
Bless 'em both!
I think he might have been changing your meaning of 3k from rpm to USD. The fun starts at $5000. You know for me I need 20k to get my fun zone in gear.