When MWC is ocurring in Barcelona, public transport (subway) goes on strike (because of the maximum impact). But usually this only fucks over non MWC attending people, because tickets are so expensive that only people which can use a taxi anyway will go, greatly diminishing the impact of the strike for attendants while making inhabitants lives miserable for that time period.
Also, Barcelona already has a very severe problem of houses being rented out to tourists with very high markups, producing a gentrification of the city (along with other factors, not only the tourism is responsible for this). Events like MWC do not help this situation.
BCN is already overloaded with tourism, events like MWC only make it worse for those of us that live there.
I'm completely aware that this is not the responsibility of MWC organization or tourists, this is a regulation problem. But since regulation is stacked against us, I can only get happier that this year we won't have to suffer all the inconvenience of the event while reaping almost none of the benefit.