Hi Cipa,
I have similar feelings about using breadcrumbs, particular with 2-3 levels. Sometimes it feels like it is wasted in terms of someone actually using it, particularly if it is near the ’home’ button the main navigation. Often it’s the difference between clicking the ’home’ link on the crumbs and ’home’ on the main nav (or clicking the logo) and perhaps this isn’t really that useful – I’m not sure.
I think in some way it comes down to the design and the parent-child content relationship. Here is a recent example of how I implemented breadcrumbs. In this case people do not need to use the drop down on the main navigation primarily and can quickly get to the parent page through the breadcrumbs. It also shows through the triangle shape the current (active) page.
The structure here is:
home -> service
home -> service -> book online
home -> service -> book online -> payment
home -> service -> book online -> confirmation