These fortifications must have had some effect. The main line of them was called the OWB (Oder-Warthe Bend) and was centered on Frankfurt am Oder. The line extended north and south from there to cover the direct approaches to Berlin anchoring on the North on the Warthe River and on the Odra river in the South.
This line included some very large works comparable to those in the Maginot Line. A typical large bunker in this line might be PanzerWerk 717 "Scharnhorst." It was a two story self-contained structure that had three cupolas for machine guns (2 in each), an automatic 50mm mortar and, a pop up flamethrower. The entry also had a machine gun in a flanking position covering it. It also had its own power and water system. The design was supposed to be able to resist 220mm fire or a 500 kg bomb hit. The concrete was 2 meters thick minimum with the cupolas being 250mm cast steel. The specification was based on what Poland had for artillery so, compared to the Maginot line the bunkers were a bit less resistant.
There were at least a dozen such positions as massive or more so in the OWB line alone. Many had connecting tunnels and there were over 30 km of these constructed. I don't know the number of smaller bunkers housing machineguns, 37mm AT guns or, 75mm howitzers but, it must have been similar to the West Wall in numbers and was probably well over 100.
There were lesser systems North and South of this one as well. All included lots of dragon's teeth and mines. River crossings were generally well defended and most, if not all bridges, were designed to be removed or destroyed along with having covering bunkers defending them.
The Scharnhorst bunker shows obvious signs of having been heavily shot up in photos I have seen of it. So, it must have been manned and used in the final days of the war.