My Jetta had a lift pump, but the one time I didn't prefill it took forever to crank it full. Maybe I could have just cycled the key, but for less work I could prefill. Mind you it was dumb-easy to prefill: install filter, and then using the vacuum extractor I used to drain the oil sump, I could pull D2 through the fuel filter. No worries about contamination.
I used to prefill oil filters, but gave it up. Not sure it does much, not with today's oils. It's only slightly longer to get full oil pressure, but otherwise it's like any other cold start.