Certainly! When I was learning piano and guitar (a long, long time ago) if there was something that didn't make sense musically on one, the other was consulted, often making sense of the problem. Admittedly, usually solved by piano, with its graphical layout of notes. Harmonies, intervals, chords, voicings et al all made more sense having two instruments there. Harmonica was also played, but I can't remember consulting that.
The technical side of playing - producing notes - won't particularly transfer instrument to instrument - unless you're considering, say, the brass family: playing a trumpet will give a head start to trombone, or woodwind: playing clarinet helps to get going on sax.
The main boost comes from knowledge gained through each instrument. Understanding harmonics comes through brass instruments. Understanding chords comes from playing guitar or keyboards (it's not easy playing triads on flute...) tone production is different, but just as important on all, but how it's produced shows difference also. Differences between just intonation and 12edo are revealed on violin, etc.
Musical skills will benefit from playing multi instruments - trying to play the same thing on several different ones will help develop execution, or sometimes underline that, actually, this instrument is better that that.That may spawn another question - who knows?
I expect the largest criterion will be time for the OP, and most of us. The old adage of 'Jack of all trades' springs to mind, but it's certainly worth persevering along the multi route for the purposes cited above, and many more I've omitted.
And another thing! When I play with others, it's so much nicer to be able to empathise, or explain something relating to another instrument/player when I can use the correct words for techniques on whatever instrument, and sometimes be able to offer help specifically. (It's not always accepted, but that's another story!)