yes, I play the same tactic: 1. E4
A chess secret...

Interesting post. Although if I played the KG I definately wouldn't play The Grand Prix (yes, I am going to call it by it's proper name ) against the Sicilian as they are completely different animals. I also don't think by playing the same 2 moves against everything you are by any means cutting down on any work. IMO Learning something more appropriate to your style like 1. e4 c5 2. d4 would still be an entirely different opening to 1. e4 e5 2. f4, like 1. e4 c5 2. f4 is.
But, there's of course no reason why at our level playing 1. e4 2. f4 shouldn't lead to reasonable middlegame positions.. I just won't be converting any time soon.
i play the french like 90% of the time against e4 and QGD against d4 (classical cambridge springs) like 80% with the scillian najdorf and semi-slav as backups...as white id say i start with d4 75-90% of the time, e4 against lower rated opponents or people ive played a few times who know my d4 setups