Just finished up a game; ended with 40 action cards (6 Vineyards). Should have been more; I panicked and grabbed a Province and a Duchy towards the end which would have been probably 5 more action cards instead.
Key cards were Worker's Village, Grand Market, Talisman. Workshop was there as well (I actually pile-drove them towards the end), but not enough free actions to use them. Moat was the only card-draw.
Anyway, what's your highest Vineyard score? (In a real game, not just messing around).