In terms of the following PR https://github.com/jenkinsci/workflow-basic-steps-plugin/pull/100 and this issue https://issues.jenkins-ci.org/browse/JENKINS-59776 the quiet option was added to the waitUntil instruction. This really helps in case you wait for something for a long time. But this doesn't resolve the problem fully. It still spams logs with the following output

[Pipeline] }
[Pipeline] {
[Pipeline] }
[Pipeline] {
[Pipeline] }
[Pipeline] {
[Pipeline] }
[Pipeline] {
[Pipeline] }
[Pipeline] {
[Pipeline] }
[Pipeline] {
[Pipeline] }

And it still really spams up the flowGraphTable "Pipeline Steps" view with these blocks.

This needs to be resolved to be silent