Latvian eID also provides cryptographic signing, and it's widely used when communicating with governmental institutions, because it's mandated by law that they must accept such digitally signed documents, and they have the same legal power as regular documents. I believe the situation in Estonia and Lithuania is probably similar. Many businesses also accept them but it's not universal.
The first time I used it for anything, apart from signing pgp keys, was to collect 200€ rent assistance and it worked flawlessly in 4 minutes.