Most people do speak English to some extent, but I have made a great effort to learn Portuguese and am now fluent. You won’t need to speak it to survive or run errands, but it makes a huge difference in terms of making friends and having a social life.
My favorite change is the slower pace of life. There is no rat race here. People work to live rather than live to work, and there’s always time for a glass of wine on a lazy afternoon.
This dish: https://leitesculinaria.com/7642/recipes-portuguese-eggs-salt-cod-potatoes-bacalhau-bras.html