Fr. Deacon Lance, indeed someone coming from a background with a liturgy based on the Nikonian reforms would notice differences in a liturgy based on the Ruthenian recension. I think it's important as well to keep in mind the liturgy is just part of the overall framework of services. I think many Orthodox Christians would notice in the Byzantine heritage Eastern Catholic churches something I would term the "mass only mentality" adopted from the Latin Church. Meaning if it's not a mass or liturgy, it won't be served.
What that translates in to is nobody serving vespers, matins or various other services throughout the festal cycles that many if not most Orthodox Christians would consider fairly standard. The anticipated or saturday vigil liturgy (instead of vespers) is another example. Orthodox Christians would also most likely notice the lack of a proskomedia, the use of pre cut particles and the absence of antidoron. A lot of stuff is missing, and it is clear it is not seeking the recovery of traditions is not always supported by the hierarchy. The archeparchial cathedral of the UGCC, really the most prominent UCGG church in the country, does not hold the services I mentioned. The Ruthenian Church, as I know you are well aware, is preparing major changes to its liturgy that a good many people are predicting will move it further away from its Orthodox siblings.
So I think keeping the bigger picture in mind is important, the liturgy is an important component of the liturgical life of the church, but not the only one.
Some Greek Catholic Churches could not be distinguished from the Orthodox, others you can definately tell they are Catholic because of lack of Iconostasis or presence of Sacred Heart images, etc.
A very few have done a very good job of recovering their authentic heritage and I have been in one. I get the feeling the majority don't wish to do so though, and that many Eastern Catholics continue to move further in to the orbit of Roman Catholicism. When I have been to EC churches, despite many of the similarities, I am always struck by how different it feels. It can be visual queus such as the ones you mentioned, but it is also a combination of factors that is hard to exactly pinpoint. It just feels different. I guess I can only say it feels Catholic, not Orthodox.
young fogey had some interesting insights about this topic on his blog.http://sergesblog.blogspot.com/2006/12/in-fluffya-ukrainian-beacon-shines_19.html