It is a bit easier, IMO, if you cast them regularly rather than all at once. It’s still a bit unwieldy but I find casting 1 Sigil every ~6 seconds & taking the max duration nodes marginally less annoying than having to stop every ~25s & spam 4 when they drop off. Not to mention it makes the mana cost esaier to deal with.
Sigils does need a review though, especially the DPS side of things (Divine Flare & the nodes behind it), which I ocassionally bring up.