Node taxonomy now appears vertically in Drupal 7 After migration to Drupal 7 the taxonomy terms now appear vertically with the vocabulary names, and it seems to be the result of Drupal 7 converting taxonomies into fields.

Is there a way to revert to Drupal 6 behaviour, ie just display the taxonomy terms horizontally as before?
If you mean you want display terms in node view horizontally, then:

if your node-type is xxxx and you vocabulary name is yyyy, add this to your CSS files:

.node-xxxx .field-name-field-yyyy .field-item {
  display: inline;
}