I went voting today as well. The election office was pretty packed with people (around the time 10:30 AM). Inside the polling booth ballpoint pens had been deposited (tied to a cord), but I brought my own writing device with me to put my votes.
Following Telegram posts, I noticed the issue that cassandra mentioned as well - depositing pencils instead of ballpoint pens in several election districts; thus voters were called to bring their own ballpens and photograph the ballot paper after putting their votes for the purpose of documentation (side note: the election office I attended prohibited any filming or the taking of photos inside the polling booth).
My election district (center of a city in Eastern Germany) is pretty much interspersed by people voting for the SPD (Social Democratic Party), The Green Party and The Left Party - at least that's been the case in the past. Let's see how they might have voted today, though it may not be much different here (if you discount possible rigging).
As for overall voter participation, it is being estimated that participation in the election has reached a historical heigh since decades - by about 84 %,
according to the German newspaper "Die Zeit".
Regarding to rigging, I think that there might have been quite a substantial amount of this going on - given that many ideologically motivated people may have volunteered as election workers. But the brainwashing of the people must have been a pretty large factor as well - I know of someone in my environment who pondered to give their vote to the AfD but in the end found a "reason" to not doing that (by watching one of those recent talk shows which framed Alice Weidel in a bad way). And then they voted for one of those parties that put us in our current mess in the first place - taking the emotionally comfortable choice, I assume.
It is understandable, given what a colleague of mine told me: She was going to vote for the AfD but felt like a traitor inside. However, she didn't plan to let that feeling dissuade her from her choice.