I came across this list of recess dates for House of Commons and I was wondering why is there so much fuss about the currently proposed one when it seems to be planned in generally the same time frame as the last year.
There are a few points to consider here.
Firstly, there is the matter of who controls when Parliament is not sitting. When Parliament goes into recess, it is they who are deciding not to sit. When Parliament is prorogued, it is Her Majesty deciding Parliament will not sit.
On a technical note, the recess to which you're referring had not been formally agreed by the House yet. There was consideration by some MPs of cancelling the recess to allow more Parliamentary time, but that decision is moot now.
While the prorogation itself will take a few days off the Parliamentary diary (probably four days, not counting what would have been the anticipated recess), there are also a number of days after Parliament returns that will be taken up by certain start-of-session formality (largely surrounding the Queen's Speech and the debate that follows it). Further, any legislation that is in progress at the time Parliament is prorogued dies, meaning that anything MPs start next week and don't finish will have to start all over again in October.