At the Church I go to, on a Wednesday morning there are normally around 20ish people and everyone offers everyone else Peace and it's lovely. It really is such a lovely part of the service. My Rector is wonderful and he is happy for you to partake or not to partake, to have a blessing or just sit... He is also really happy for you to get up and walk around or walk out - he has had mh issues himself, so he "gets it" and is one of the most lovely people!