'Nother psst: ain't no perfect Catholics. Some pretty good ones, I guess ....)
It's not so much whether one CAN as why one would want to. But yeah, rarely in our "required" liturgical worship is anyone but some person or other of the Trinity addressed. Sometimes Mary is addressed, but rarely. In my parish at the Easter Vigil we have a litany of the saints and ask a whole WAD of saints to pray for us and for those about to be baptized. Other than that, there's not any expectation.
But the other side of it is an increasing sense of having a BUNCH of friends and fellow warriors. - and of finding them where one least expects it. My personal image of myself is that asking French women to pray for me is certainly not something I would do of my own accord. But somehow I find that the stern and simple Catherine Laboure or the deceptively child-like Terese of Lisieux are good friends. It runs against ALL my inclinations, and my own "conceit" of myself is that if anything (or anyone) I would be affiliated with Polycarp or John the Evangelist, or John of Damascus (There was a thinker!) -- certainly not someone FRENCH, for crying out loud!
But when I go up against all the temptations and tests of everyday life, I find to my surprise that, as I pray mostly to Jesus, I have Catherine and Terese rooting for me. I am surrounded not with a silently watching cloud of witnesses, but with friends who, when I stumble, rush to the track to encourage me, who give me advice and help, who assure me that I am in their prayers.
It's quite remarkable. I wasn't thinking much about the intercession of the saints when I became Catholic. I was thinking about obeying Jesus. But I have found friends.
I am saying this soppy stuff to try to give a "feel" of what our piety to the saints is. I could almost say that my feeling about Catherine Laboure is in many ways very much like my feeling about a sergeant I had once. He was very different from me, but we both share a commitment to excellence and to caring even for the bad guys. And he's very wise about fighting. He's a good man to have on our side.
I don't mean this to be persuasive but descriptive.
Thank you for your POV! I appreciate it! :-)