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I'm a little bit crazy about window alignment, so:

it would be cool if one could switch on some grid (similar to those known from inkscape or so) for arranging widgets on the desktop. When a widget is moved or resized, it will snap to the grid. Maybe it's already enough if a widget would "dock" during movement or resizing, whenever it is at the same horizontal or vertical line as another widget. The behaviour should be similar to common image tools... I hope it's clear what I mean...

The goal is to have equivalent space between and size of widgets.

This is two ideas, snap to grid and align to other widgets. Both are duplicates. I marked the former as the duplicate, the latter is a duplicate of:
brainstorm.php#idea39474

Thank you, didn't see these other two... Great that there is such a fast response!
One question about the general process, though: the idea you posted is marked as submitted and it's not possible to vote for it anymore. So the process is: come up with an idea, get "enough" votes -> it gets submitted, you can not vote anymore, it might be included in an update, sooner or later.
I had a look on the FAQ but couldn't find any details about it: after how many votes is an idea submitted? Or is the number of votes just some kind of ranking for the most popular ideas? How are the chances for a submitted idea to be realised? And in what approx. time frame?

Thanks for the help as I'm new to this...

There is an algorithm that takes into account votes, age, and other properties to rank the idea into priorities. Those with high priorities are submitted to bugs.kde.org when we get around to it. You can comment on the idea there.