The union of galaxy clusters and gravitational lensing turned out to be most prolific and a particularly versatile tool for astrophysics and cosmology. I will present a selection of our recent results based on data from the Cluster Lensing and Supernovae Survey with Hubble (CLASH), the Hubble Space Telescope Frontier Fields (HSTFF) and the Kilo Degree Survey (KiDS). The focus will be on dark matter density profiles derived from multi-wavelength probes, the concentration-mass relation of galaxy clusters, the calibration of the Planck cluster mass scale, lensed supernovae and the high-redshift Universe using clusters as cosmic telescopes. Towards the end of the presentation I will suggest possibilities to optimally exploit future surveys such as Euclid, LSST and WFIRST, where the focus will be on optimal mass mapping techniques and agnostic ways to characterise the full morphology of structure in the sky with computer vision and machine learning.