I never really understood the "I have 11billion tabs open for 8 days!" thing. The most I can ever muster is about 4, and generally they are very specific
Depends on use, which is highly personal and also may be "seasonal". I now only have 11 tabs at startup, a few just local (intranet resources like company email). While I was more active with research, I had much more because I needed lots of references to confirm or dispute or make sense of my findings, and tabs needed to "persist" so that the flow of data (analysis, investigation) doesn't get cut off from one session to another, especially because when one reference cites 5 other important references, and each of those has 3-5 good references as well, it becomes impossible to linearly go through all of them at one session, and you need a way to make sure the browser "saves state" so that at the end of the day, you close it and the next day you can pick up much faster than when you left off. This is also the primary reason why it is not unreasonable to see people engrossed in study or research to have multiple tabs in multiple instances of the browser - each instance is a logical group of tabs for a certain branch of research, which adds yet another layer of organization into reference materials. It all adds up in the end when your productivity is retained despite being knee-deep in reference materials.
Well, they do have almost non-existent seek times, but their data transfer speeds (last I checked) were roughly the same as a normal hard drive.
That's because maximum data transfer speed is rarely what makes the system "slow" or "fast". In the context he presented, SSDs are certainly much faster, which is also reflected in real-world use. I doubt there is any reasonable use case beyond "transferring files all day long to different disks" that will invalidate the general statement "SSDs are much faster than harddrives". It is not worth picking on him for.
However, the other statement you quoted is very well justified. I do not feel he has justified it enough with his described use case - unless the issue is not just main memory / storage related (which is solved by more RAM and fast SSD), but also processor-related, if most of his tabs have some sort of flash ads, in which case it may swamp a core2duo but can be handled by the i7 without breaking a sweat. What makes me not believe that to be the case is his claim that his CPU utilization is ~10% now - that kind of load, transferred to a C2D, would nowhere be enough to create a CPU-bottleneck situation.
Either way, he probably saw the biggest benefit from getting more ram. No doubt half the effects that he was touting would have been accomplished by simply upgrading his ram (and possibly getting a new video card.)
The effects of SSD are well-documented from almost every review site in the planet, the reliable ones and even the non-reliable ones, so downplaying the SSD performance benefit seems a bit coming from left field. It is almost as close to "universal tech truth" as we can get. Upgrading from an HDD to an SSD is the single best upgrade you can do that will result in the most noticeable performance gains, from boot up to shut down.