Agreed, though of course not every organometallic reagent is alike. It's quite alright to let students try to do a Grignard reaction (the generation of the Grignard reagent being famously finnicky in the hands of beginners and experienced chemists alike) once they have safety training behind them, it's quite another thing to let them work with even more flammable, explosive or toxic compounds. Some other more benign organometallic compounds are porphyrin and phtalocyanine dyes and various nicely colorful coordination complexes.
One other sad incident with organometallic reagents was the death of Sheri Sangji[0], she was scaling up a reaction involving tert-butyl lithium, which resulted in a deadly fire. It was thought the accident was a result of a series of safety failures (bad safety education, bad ppe, weekend work) and the university and supervisor were (imo, correctly) held culpable for creating the conditions in which such a horrible accident was possible. This one is also quite scary because many organic chemists will routinely use n-Bu-Li and occassionaly tBu-Li, the deadly and more pyrophoric agent involved in this accident as well.
[0]https://en.wikipedia.org/wiki/Sheri_Sangji_case