The only benefit I have ever derived from going to a non-catholic church is to experience the lack of His presence.
When you walk into other churches, people (generally) behave similarly to how they act when they go to a concert or presentation; they wander around, have loud, idle conversations, etc… There are some exceptions to this of course, but this has been my general experience.
When you walk into a Catholic church, people (generally) behave similarly to how they act when they go to a library or a cemetery; they instantly become quiet and still. There are some exceptions to this of course, but this has been my general experience.
To me, this a testament to the True Presence. Something in our very core instantly knows that we are in a sacred place; not a place where we just talk about Jesus, but a place where Jesus comes to us and waits patiently there for us.
I remember attended a wedding a few years ago at a local baptist Church and I was instantly struck with this feeling of emptiness; there were pews, there was a cross (with no corpus) there was a choir area… but there was no tabernacle. He was not “there” anymore than He is with me when I was in the parking lot or at the grocery store.
God is always with us… but when we are in the presence of the Eucharist, we are present at Calvary. God draws us up to Him.
Ultimately, I think this quote about the soul sums up my feelings about attending other churches:
“If anything could prove the existence of a soul, it is the utter emptiness of a corpse.”
-Mary Doris Russel
If anything could prove the true presence in the Eucharist, it is the utter emptiness of a church without it.