PART of my ministry is the "church circuit"...I believe that if we truly are all one body of Christ..Catholics-Protestants-Orthodox-Episcopal-et al, ...then we need to particpate in an "integral" manner in the body of Christ, and this means not just having one congregation as much as that is convenient for the pastor of the church and the members as well, but that we need to get up and visit other congregations and "mix it up" as they say. If you ever visit a new church, especially a small one, you can be sure there will be some members who immediately KNOW that you are a visitor, and it is an awkward feeling.
That's why these members need to also visit other churches and be visitors themselves at times. Sometimes churches get too small, even large churches may have a certain "smallness" about them, even "cliques" at times. This has its pros & cons, the cons being that they become "exclusive"...devoted to the comfort of the core members. It's not easy walking into a new church with the "deacons" or "Greeters" ready to give you a bulletin...which seems nice but at the same time they are, essentially, the "guards" of the church.
I actually like churches that do not have greeters, as nice and innocent & well-intended as they may be. Some Roman Catholic churches that have daily mass do not have greeters and you can walk in without feeling like a "newcomer" at times. But beyond the "first time" phenomenon it's good to learn about other faith traditions and how they "operate" at the local level. It's good to know about the Catholic eucharist if you come from a protestant tradition (albeit remember some catholic churches are strict about "only catholics" participating in the eucharist...but you can still join in worship...best thing is to not announce yourself as a visitor and just follow along...and when it comes time for eucharist if feel it's better not to take eucharist, then just remain seated during the eucharist procession).
There's SO MANY different church traditions and styles of worship & liturgy, but we are all ONE body of Christ...almost all, if not all, of the traditions mentioned here recite the Nicene Creed (and/or Apostles Creed) which says we believe in the "Holy Catholic Church" which in this case means the "universal church" or body of Christ (remember there's "Catholic" and there's "catholic"...one most often refers to the Roman Catholic church, and the latter means "universal"or "all" ...ie all who profess Christ as their Savior and believe in the Triune God..ie Trinity--Father-Son-HolySpirit).
