People often advocate entering a long runway at half length in order to expedite departure. My own view is that it's foolish to throw away the opportunity to land back on in the event of an engine failure after takeoff, so I always start as far back on the runway as I can as it gives me an extra safety margin.
I like having SV and GPS in my aeroplane because it gives me an extra safety margin, not because I'm a lazy pilot who can't be bothered with situational awareness.