Hard to give a general answer to your question, as there are so many pilgrim paths (Jakobswege) in Germany. To give you an idea, I have included a link to a map.
On many Jakobswege there is no or very little pilgrim infrastructure. But there are exceptions. Most notably the Via Regia (Gorlitz- Vacha). I walked this, staying in an albergue (Herberg) every day for three weeks. The Elisabethpad from Eisenach to Marburg also has a good albergue structure. On the other hand, on my walk from Nijmegen to Cologne, I only came across one albergue.
I can only comment about these three paths, as I have walked them (although I will walk some others this autumn).
Please note, German albergues are not the same as what you may be used to in Spain. There is no staff or hospitalero on side, but one usually has to collect a key. But the price is usually somewhere around 10 euro's and often there are kitchen facilities.
If you are seriously interested, there is quite some more info about Germany on this forum, particularly about the Via Regia.