Daz,
The work you have today is when wfp comes into its own. I would estimate I get roughly a 30% time saving on very compact 4 bed houses compared with trad.
What you must remember though, is many of the guys who champion wfp on this site don't have years of trad experience. Fact is trad is quicker on many properties, and far less hassal - if your a skilled trad guy. Anyone who isn't will probably argue that point. I wonder if this site has raised your expectations of wfp a little to high. Don't use it for the sake of it, take every job on its merits.
Keep at it though brother, it will get easier.