Hi Mark,
I exchange e-mails with several keepers in Europe and have numerous articles translated from the European hobbyist literature. We have some trouble conversing but ultimately the point gets across.
In a nutshell, they tend to use very large, planted vivaria for just about everything. Racks are for hatchlings, but many raise their babies in planted tanks as well.
I'm referring to mainland Europle. In England and Scotland they follow the more American style of keeping - sterile racks.
A couple of further points.
In many translated books/articles you will read about minimum cage sizes that are absolutely huge. For example, the Gonysoma I keep have a recommended cage size of 5'x5'x5' in German articles. A 10% increase from there is required for any additional specimen kept in the cage.
But in reality the cages used are not nearly that large. In Germany and other parts of Europe there are humane requirements for such cages and the authors simply regurgitate these recommendations. Don't get me wrong, they still use HUGE cages, but a pair of Gonyosoma (ratsnake) do not get a walk-in room. Probably more like 48"x30"x36".
Another interesting point is how some of them interpret behaviors in such large cages. In the US we often remark that small cages are better because in large cages the snakes seem nervous and don't feed as well. But in continental Europe they interpret this as more natural behavior and indicative of a snake that is being kept properly.
Very interesting paradigm.
It's important to point out that the Europeans pretty much have us whooped when it comes to breeding difficult species and the number of generations produced by moderately difficult species. That should not be lost on use Americans.
My only other point is ventilation. If you read the Chondro forums here or on other sites there is a huge emphasis on minimal ventilation to keep humidity high.
The Europeans I talk with find this philosophy totally laughable. Their idea is that ventilation is a good thing. If maintaining heat is more difficult then heat the room - it's cheaper anyways. If maintaining humidity is more difficult then mist them more often. In other words, don't compromise the ideal environement for the snake out of laziness.
That is similar to their ideas about large cages. Don't keep snakes in small cages so you can keep more snakes, keep snakes in large cages so you can keep fewer snakes better.
As you probably know, I'm taking steps towards a more European/Philipe de Vosjoli style of keeping my Gonysoma.
Hope you get a lot of responses.

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Current snakes:
1.1 Gonyosoma oxycephala - (Silver/Yellow)
2.2 Gonyosoma oxycephala - (Green)
4.3 Gonyosoma janseni - (Black)