I haven't damaged any 2N7000s, I think, although I don't use many compared to 2N3904 and such (let alone SMTs). I probably would have damaged a few over the years if I did, particularly in the early ears.
Understanding how to handle components and avoid ESD is more important, I would say. Static builds only when you move around, and it's static discharge that kills. Discharge to, much of anything really -- the resulting EMP burst is quite fast-rising and induces into everything nearby, but especially direct hits, of course. The peak current can be 10s of A, for mere 10s of ns, but this is more than enough to damage microscopic semiconductor structures; literally blow them up, material gets displaced, removed, vaporized in the process.
Working on a mildly conductive (static dissipative) surface helps greatly, and even without, one can practice safely by grounding to the circuit/equipment being worked on. So, say you're building a PC, just every time you reach inside, remember to touch your body to the metal enclosure, and you'll be safe at least until you shift your position (beware shifting in your chair, idly suffling your feet, etc.).
You don't need to be galvanically grounded, but it does serve as a universal reference, and all you need then is to tie equipment to the same ground, and everything's unipotential. This is the industrial grade solution: make floors and workbenches mildly conductive, make personnel mildly conductive usually by shoe and wrist straps, and occasionally straps for the equipment itself. Tools can be grounded (e.g. soldering iron's metal housing), at least with a large resistor (again, mild conductivity, all that's needed to address ESD; some resistance to an iron might be a good thing in case the equipment you're working on isn't completely discharged, or off even(!)).
So, for breadboarding, just touching the power supply, or ground wire, or scope probe clip, or whatever, every once in a while, suffices.
Tim