True the French were the first to use it, but it was a very different weapon to the British, or should we call it the 'modern' bayonet (the really modern one is basically just a long knife) as I don't think the British actually invented it, but merely adopted it.
The French, initial, bayonet was a simple on the spot device. It was a blade with a handle you put into the barrel of the gun. Obviously that presented certain problems for the user, such as when is it prudent to use it, how can I shoot with it in place etc. The modern bayonet removed such problems and gave the user a readily useable short range defensive weapon, which later became a highly offensive weapon as tactics developed.
The modern bayonet was a quantum leap in effectiveness over the old French bayonet. But indeed it was hardly as important as the MG or repeating rifle.
I will personally say the machinegun, though the howitzer certainly does make a powerful case, being the most deadly weapon ever (it has the highest single toll of human life from human generated means, with about 60% of WWI casualties and another 40% from WWII), and it has only existed for around 150 years. Though the precursor, the bombard, is pretty old.
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