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Phil, of-course boats crossing the seas were being used before the construction of the Dover Bronze Age Boat, but our boat is the oldest one that is in existence.
In this sense, it is the oldest sea vessel in the world.
When examining such craft, it is possible to determine whether they were used at sea or along rivers owing to scientific evidence that is found on the wood.
It is also quite obvious that sea craft were operating from Dover long before the vessel that came down to us, only none of these older ones has ever been discovered.
It has never been stated that the Dover Boat is the oldest one that ever existed in Dover or elsewhere in the world, but it is the oldest to have been found.
As for commerce between Britain and Europe in the Stone and Bronze Ages, this would have come primarily through Dover, being visible from Gaul and having an estuary for docking. It is unlikely that crossings would be made from Scandinavia or Spain to any part of Britain during the Bronze Age, as the distances would make such attempts far to risky for the vessels in use then.
More likely that items from Scandinavia, Iberia and elsewhere would be transported by land (and river) to the Calais area (Calais would have had another name then), and then transported to Dubra (Dover) and sold on the market or to a whole-sale importer.
Even the Greeks, Phoneaceans and Romans didn't travel by ship as far as Scandinavia, for all that their ships of the late Iron Age were more modern: they would have docked somewhere in Gaul and sent the products by land and river (the Rhine) to Denmark, and from there the Danes would have been able to transport them by sea to nearby Sweden, which is only a few miles away from Denmark, and from Sweden to Norway.
No-one would have crossed in the remote Bronze Age from Britain over the North Sea to Scandinavia, though!
So whether one agrees or not, it is clear that only Kent, and primarily Dover, was the place for seafaring ships to operate from between Britain and Europe.
Dover certainly had seacraft many centuries before the one which was discovered, only none of these older ones (or later ones) ever survived the elements.
In fact, the very first people to step foot in Britain must have arrived in Dover! They certainly did not cross the sea from Scandinavia. Can you see Scotland from Norway?