My experience is that doing so has had a minor improvement in my J->E recall, but a major improvement in my E->J recall. If you never intend to write/speak Japanese and just want to build to watching anime or something, I guess you could give it a miss, but I think it's pretty worthwhile.
The one caveat with Anki specifically for reversed cards is when you add a bunch of new cards or a new deck and it presents you the reversed card right after the basic card.
e.g. seeing the 幸せ -> shiawase (happy) card then immediately after the happy -> 幸せ card, sure you're going to be telling Anki this was an "easy" card, but that's much more about the immediacy than the level of recall you have.
For my purposes I actually have three sets of cards in my Japanese deck, one each for kana, kanji and english front card and the other two on the reverse cards (unless my textbook omits the kanji because of it being rarely used in the real world, as for some words).
> unless my textbook omits the kanji because of it being rarely used in the real world, as for some words
I have found this usually proves to be a mistake, textbooks and dictionaries pretend that you need far less kanji than you actually do. Lately I started to mine Anki words from conversations on Japanese twitter and I discovered that everyone casually throw around all kinds of kanji that are not on the Jouyou list and in words every textbook insisted were primarily kana.
I think it might be because modern IMEs have made it much easier to casually use rare-ish kanji. Technology has expanded the range of everyone's recall and writing speed, while the textbooks are still reflecting the world of 20 years ago.
The one caveat with Anki specifically for reversed cards is when you add a bunch of new cards or a new deck and it presents you the reversed card right after the basic card.
e.g. seeing the 幸せ -> shiawase (happy) card then immediately after the happy -> 幸せ card, sure you're going to be telling Anki this was an "easy" card, but that's much more about the immediacy than the level of recall you have.
For my purposes I actually have three sets of cards in my Japanese deck, one each for kana, kanji and english front card and the other two on the reverse cards (unless my textbook omits the kanji because of it being rarely used in the real world, as for some words).