You could check on the $node being viewed with {$node.object.section_id}, i.e.
{section show=$node.object.section_id|eq(1)}
Load section 1 page {/section]
Note: the eq syntax might be wrong. Alternatively if you are not in the node template then use {$module_result.section_id} to get the current section.
Tips {$node|attribute(show)} lists all available attributes for $node, where $node can be any variable.
Unfortunately I can't get it to work. If I'm not mistaken, I can't use 'node' when caching is disabled. Is that correct? I've disabled all my caches and try to use the following code: