I live just west of Poole, and believe me the whole of Dorset and not just Bournemouth is gridlocked when the weather is good, which is most days at the moment (thermometer at 30 at the moment)
That is why it is in the news, it is so much busier this year because people are flocking to the coast instead of Spain and Greece, and I can't say I blame them because its a great place to be and the weather is usually better than further west in Devon and Cornwall.
I haven't been to the beach so far this year as a result of the influx, hopefully it will all die down a bit in September.