German here. It would be interesting to see how workload varies between signposter GPs and gatekeeper GPs. It could be that workload is shifted onto specialists (as in Germany, where children see pediatricians). Having moved from a signposter to a gatekeeper culture (the NHS), I must say that given a manageable workload, I find the UK system far more holistic and efficient.
In addition, it’s important to look at the support system that doctors have. German doctors’ assistants are often far less well trained and qualified than the practice nurses and midwives that work in a typical UK group practice.
It seems to me that the UK doesn’t realize what it has in its GP system.