My DS1 finished year 1 just over a week ago. I was initially very anxious for him last September with the change as our school don't transition them during the first term.
During reception everything is very play based & they have 'golden time' every afternoon.
In year 1 they would only get 'golden time' on a Friday afternoon. It took him at least until after the October half term to really settle in & get the hang of things. They did do more book work, more writing & mathematics but from what I can see (the school are always taking pictures in class & displaying them on a projected screen in a morning for parents to see) it was very much fun based & not just sitting behind a desk with repetitive learning. They did a lot more projects, each term they did at least one, sometimes two projects which took them outside the classroom quite a lot. Sometimes it was just a trip to the local farm, others were full on day out trips & one project they had superheroes in school which they all loved.
What I haven't loved about year 1 is the phonic testing. I really don't agree with testing at this young age even if the kids don't know they are being tested. I found it very difficult because I obviously wanted to help my son learn the phonics & understand the importance of them without putting pressure on him. The kids must know something important is going on, the teachers are under pressure, the parents feel some form of pressure & the kids must know even though they are not told they are being tested.
Overall I think that my son has enjoyed year 1 & is ready to move up to year 2. I'm not so anxious for DS1 for this upcoming September as I was the last. Anxious for DS2 though who starts reception.