Thanks for clarifying the role of the science lab. I still cannot understand, though, why reading a geiger counter, a temperature gauge or a barometer, for example, would take several minutes to complete and generate several kilobytes of data. If Kerbalism is intended to bring some realism to KSP then, on this point, it is failing. This is particularly relevant in the early game by the very limited 'hard disk' on board the stock capsule which can only store the results of one of the two available data experiments (geiger counter and temperature gauge) and one slot for a physical experiment (the goo). The result is that you have to repeat launches just to get basic data. It doesn't help that the additional capacity isn't available in the tech tree until you have, I think, 45 science - that can seem like a completely unattainable goal. As science is so critical to progression in career mode, the changes to science in 3.0 are too limiting.
I'm guessing that there isn't a way to go back to the old science as it was in 2.2 (as nobody seems to have responded to that part of my post). That being the case I'm going to drop Kerbalism.